DESC:TECHNICAL FIELD

The present disclosure generally relates to field of automobile engineering. Particularly but not exclusively present disclosure relates to transmission assembly of a vehicle. Further embodiments of the present disclosure disclose a gearbox for transmitting power from engine to wheels of the vehicle.

BACKGROUND OF THE DISCLOSURE

Generally vehicles are provided with transmission assembly for transmitting power generated by a prime mover i.e. engine to the wheels for maneuvering the vehicle. The transmission assembly generally comprises of a gearbox, differential assembly, and wheel axles. The transmission assembly is coupled to a crankshaft and wheel axles for transmitting the power. The gearbox is used in the transmission assembly for varying transmission of power i.e. torque from the engine to the wheels based on the requirement. The gearbox will be provided in between the differential assembly and the crank shaft, and is configured to vary the torque from input to output.

Conventionally, manual shift type gearboxes such as constant mesh gearbox, synchromesh gearbox, and sliding mesh gearboxes are known in the art. The constant mesh gearboxes utilizes selectively engageable positive or jaw clutches which are usually moved axially into and out of engagement by shift forks carried by shift bars or rails. In such constant mesh gearboxes, the clutch is mechanically moved for selecting the gears in the gearbox which results in frequent wear and tear (damage) of the clutch. Further, in the case of synchromesh gearbox, the gearbox uses a plurality of shifter dogs operated by the gear lever which are provisioned to engage the particular gear with the output shaft. The shifter forks are operated only after disengaging the clutch from the flywheel. However, in such synchromesh gearboxes, problems such as jerks, limitation imposed by clutch, slow shift speed and interruption of power flow exists. This reduces the performance and power transmission of the vehicle.

Further, in recent past automatic mechanical transmission systems have been developed, and are used in the transmission assemblies of the vehicles. In such automatic mechanical transmission systems, electronic central processing units are utilized to automatically cause synchronization of positive jaw clutches by automatic manipulation of engine speed and the vehicle master clutch. However, such automatic transmissions involve complex construction due to presence of complicated gear selection mechanism through hydraulic circuits and clutches. This also results in high bearing loads on the gearbox, and thereby reduces the fuel economy. In addition, in such transmission units the inherent inefficiency of a torque convertor results in reduced overall fuel economy.

In some of the high performance vehicles such as but not limiting to passenger cars, and sports utility vehicles there exists a great demand for lightning fast and jerk free gear shift mechanisms. Dual clutch transmission systems are the current state of the art devices that cater to this need. However, such dual clutch transmission systems are complex in design due to presence of inner shaft and an outer shaft. This mechanism also uses complex elements such as hydraulic circuits, shifting rods, shifter forks etc., to engage and disengage the clutches and selecting gear ratios. This makes the gearbox heavy and complex, and also increases the lubrication requirement.

In light of the foregoing discussion, it is necessary to develop an improved gearbox to overcome one or more limitations stated above.

SUMMARY OF THE DISCLOSURE

One or more shortcomings of the conventional assemblies are overcome by assembly as claimed and additional advantages are provided through the provision of assembly 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.

In one non-limiting embodiment of the disclosure, there is provided a gearbox for a vehicle comprising a first shaft positioned in housing and is connectable to an output shaft of an engine. The first shaft accommodates a plurality of forward driving gears and at least one reverse driving gear. The gearbox further comprises a second shaft disposed parallel to the first shaft in the housing. The second shaft accommodates a plurality of forward driven gears and at least one reverse driven gear. Further, the second shaft is positioned in the housing such that the plurality of forward driven gears on the second shaft are in constant mesh with the plurality of forward driving gears on the first shaft and the at least one reverse driven gear on the second shaft is in constant mesh with the at least one reverse driving gear on the first shaft through an idler. The gearbox also comprises at least one magneto rheological clutch positioned adjacent to each of the forward driven gears and the at least one reverse driven gear on the second shaft. Each of the at least magneto rheological clutch selectively engages a corresponding driven gear with the second shaft to transmit power from the first shaft to the second shaft.

In an embodiment of the disclosure, the magneto rheological clutch comprises a casing, at least one first plate positioned in the casing and is coupled to corresponding forward driven gear and the at least one reverse driven gear. Further, at least one second plate is configured adjacent to the at least one first plate in the casing, wherein the at least one second plate is mounted on the second shaft. The magneto rheological clutch further has an energizer coil housed in the casing and a magneto rheological fluid disposed in between the at least one first plate and the at least one second plate.

In an embodiment of the disclosure, the energizer coil is an electromagnet. The energizer coil is adapted to energise the magneto rheological fluid to selectively couple the at least one second plate and the at least one first plate of the corresponding forward driven gears and the at least one reverse driven gear to transmit power from the first shaft to the second shaft.

In an embodiment of the disclosure, the energizer coil is provisioned in the circumference of the casing.

In an embodiment of the disclosure, the at least one first plate and the at least one second plate are arranged concentrically to each other. The magneto rheological fluid is provisioned in annular gap between the concentric plates.

In an embodiment of the disclosure, the magneto rheological clutch is interfaced with an Electronic Control Unit (ECU) of the vehicle. The ECU is configured to selectively operate the magneto rheological clutch of the corresponding forward driven gears and the at least one reverse driven gear.

In an embodiment of the disclosure, each of the at least one magneto rheological clutch is interfaced with a switch for selectively operating the corresponding at least one magneto rheological clutch.

In another non-limiting embodiment of the disclosure, the vehicle comprises a gearbox as disclosed above.

It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the disclosure.

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 FIGURES

The novel features and characteristic of the disclosure are set forth in the appended description. 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 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:

FIG.1 illustrates perspective view of a gearbox according to an embodiment of the disclosure.

FIG.2 illustrates sectional perspective view of the gearbox of FIG. 1.

FIG.3 illustrates schematic sectional view of gearbox of FIG.1 according to an embodiment of the disclosure.

FIG.4 illustrates schematic sectional view of a magneto rheological clutch used in gearbox of FIG.1 according to an embodiment of the disclosure.

FIG. 5 illustrates a schematic block diagram of the gearbox according to an embodiment of the present disclosure.

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 structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION

The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other assembly for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the scope of the disclosure. The novel features which are believed to be characteristic of the disclosure, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.

To overcome one or more drawbacks mentioned in the background, the present disclosure provides a gearbox for a vehicle. The gearbox disclosed in the present disclosure provides continuous flow of power from engine of the vehicle to the wheels. Further, the gearbox disclosed is light weight and requires a comparatively lesser lubrication. The gearbox can be configured as either manual or semi-automatic depending on the requirement in the vehicle. The gearbox comprises gearbox housing connectable to a vehicle frame. The gearbox housing is configured to accommodate or house all the components of the assembly. The gearbox comprises a first shaft also referred as input shaft, is disposed in the gearbox housing and is connectable to a crankshaft of the engine. The first shaft accommodates a plurality of driving gears, the driving gears are in the form of forward driving gears and reverse driving gear. The number of forward driving gears depends on the transmission assembly of the vehicle. For instance, if the vehicle is a 4-speed transmission assembly, there will be four forward driving gears and at least one reverse driving gear. The same logic can be extended for different transmission speeds of the vehicle. The gearbox further comprises a second shaft also referred as output shaft, disposed parallel to the first shaft in the gearbox housing. The second shaft is connectable to the drive axles of the vehicle. A plurality of forward driven gears and at least one reverse driven gear is mounted on the second shaft and these gears are constantly in mesh with the forward driving gears and at least one reverse driving gear mounted on the first shaft. Further, the gearbox comprises an idler in mesh with the reverse driving gear and reverse driven gear, the idler is configured to reverse the direction of rotation of the second shaft. The term constant mesh used herein above and below refers to a meshing condition of the driving and driven gears in the gearbox. In such a constant mesh condition each of the driving gear is in constant mesh with the corresponding driven gear in the gear box.

The gearbox further comprises at least one magneto rheological clutch associated with each of the forward driven gears and at least one reverse driven gear. The magneto rheological clutch is configured to selectively engage a corresponding driven gear to the second shaft for transmitting power from the first shaft to the second shaft. In an embodiment of the disclosure, the at least one magneto rheological clutch associated with each of the plurality of driven gears is interfaced with an Electronic Control Unit (ECU). The ECU is configured to operate the at least one magneto rheological clutch depending on the requirement. In an alternative embodiment, the at least one magneto rheological clutch associated with each of the plurality of driven gears are interfaced with a switch for operating the gears manually from the driver cabin. It must be noted that the gear could be changed either manually by receiving the input from the driver or one or more control units in the vehicle decide the optimal gear ratio based on the vehicle parameters like speed, load etc., and accordingly send signals to activate or deactivate one or more magneto rheological clutch to obtain the required gear ratio.

Henceforth, the present disclosure is explained with the help of figures of a gearbox used in 4-speed transmission assembly. However, such exemplary embodiments should not be construed as limitations of the present disclosure, since the gearbox assembly may be extended to any transmission assembly such as 5-speed, 6-speed, etc. A person skilled in the art can envisage various such embodiments without deviating from scope of the present disclosure.

Referring to FIGs. 1 and 2 which are exemplary embodiments of the present disclosure, respectively illustrating a perspective view and a sectional perspective view of a gearbox (100) used in 4-speed transmission assembly of the vehicle. The gearbox (100) will be provided in the transmission assembly for varying transmission of power i.e. torque from the engine to the wheels based on the requirement. The gearbox (100) comprises a gearbox housing (114) [shown in FIG.5] which is configured as a support for the gearbox (100). The gearbox housing (114) may be mounted onto the vehicle body through a suitable means and is adapted to house all the components of the gearbox (100). The gearbox (100) comprises a first shaft (101) disposed in the gearbox housing (114), and is connectable to a crankshaft of an engine. In an embodiment of the disclosure, the first shaft (101) is coupled to the engine of the vehicle. The first shaft (101) accommodates a plurality of driving gears (102 and 103), the plurality of driving gears include forward driving gears (102) and at least one reverse driving gear (103). The plurality of driving gears (102 and 103) are configured to rotate along with the first shaft (101). The first shaft (101) and the plurality of driving gears (102 and 103) are configured to rotate at same speed as the speed of rotation of the crank shaft of the engine. In an embodiment of the disclosure, the plurality of driving gears (102 and 103) mounted on the first shaft (101) are configured with varying diameter and number of teeth to vary the transmission of torque from first shaft (101). In an embodiment of the present disclosure, the diameter of the plurality forward driving gears (102) is in incremental order from the first gear of the forward driving gears (102) to the fourth gear of the forward driving gears (102) in a 4-speed transmission assembly.

The gearbox assembly (100) further comprises a second shaft (104) disposed parallel to the first shaft (101) in the gearbox housing (114). The second shaft (104) is connectable to at least one of drive axles and differential assembly of the vehicle for transmitting power from the crankshaft to the vehicle wheels. Further, the second shaft (104) accommodates a plurality of driven gears (105 and 106). The plurality of driven gears is in the form of forward driven gears (105) and at least one reverse driven gear (106). The plurality of driven gears (105 and 106) on the second shaft (104) are configured to be in constant mesh with corresponding driving gears (102 and 103) of the first shaft (101). The driven gears (105 and 106) mounted on the second shaft (104) are configured with varying diameter and number of teeth to vary the transmission of torque from the second shaft (104). In an embodiment of the present disclosure, the diameter of the driven gears (105 and 106) is in decrement order from the first gear of the plurality of forward driven gears (105) to the fourth gear of the plurality of forward driven gears (105). Further, the reverse driven gear (106) of the second shaft (104) is meshed with the reverse driving gear (103) mounted on the first shaft (101) through an idler gear (107). The idler gear (107) is configured to rotate the second shaft (104) in a direction opposite to the direction of rotation of the first shaft (101) when vehicle is to move in a reverse direction.

FIGs.3 and 4 are exemplary embodiments of the present disclosure, respectively illustrating schematic sectional view of a gearbox (100) and schematic sectional view of the magneto rheological clutch (108). The gearbox (100) comprises at least one magneto rheological clutch (108) positioned adjacent to each of the plurality of forward driven gears (105) and at least one reverse driven gear (106). The magneto rheological clutch (108) is configured to selectively engage the second shaft (108) with at least one of the plurality of driven gears (105 and 106) to transmit power from first shaft (101) to the second shaft (104).

As shown in FIG.4 the magneto rheological clutch (108) comprises of a casing (109) which forms the outer part of the magneto rheological clutch (108) to house all the components of the clutch (108). The magneto rheological clutch (108) comprises a first plate (110) housed in the casing (108) and is coupled to a corresponding forward and reverse driven gears (105 and 106). In an embodiment of the disclosure, the first plate (110) is joined with the corresponding driven gears (105 and 106) such that it forms a spline joint. Further, the casing (109) of the magneto rheological clutch (108) houses a second plate (111) adjacent to the first plate (110). In an embodiment of the disclosure, the second plate (111) is mounted on the second shaft (104) and the joint between them is spline joint. In addition, a fluid - magneto rheological fluid (113) is disposed in the magneto rheological clutch (108) of the gearbox (100). The magneto rheological fluid (113) is disposed in between the first plate (110) and the second plate (111), i.e. the magneto rheological fluid (113) flows in an annular gap provisioned in between the first plate (110) and the second plate (111) inside the casing (109). The magneto rheological clutch (108) further comprises an energizer coil (112) to energize the magneto rheological fluid (113). In an embodiment of the disclosure, the energizer coil (112) is an electromagnet. The energizer coil (112) is provisioned in a casing (109) of the magneto rheological clutch (108) and is interfaced with a power source such as battery. In an embodiment of the disclosure, the electromagnet (109d) is provisioned around the circumference of the casing [as shown in FIG.4].

The term magneto rheological fluid used herein above and below is a type of smart fluid in a carrier fluid, usually a type of oil. When subjected to a magnetic field, the fluid greatly increases its apparent viscosity, to the point of becoming a viscoelastic solid. Importantly, the yield stress of the fluid when in its active ("on") state can be controlled very accurately by varying the magnetic field intensity. In summary, the fluid's ability to transmit force can be controlled with an energizer coil (112) such as an electromagnet, which gives rise to many possible control-based applications. Further, the term magneto rheological clutch (108) used herein above and below refers to a power transmitting member/assembly which uses a magneto rheological fluid as an interface/medium for achieving contact between two moving members such as shafts/plates.

In an exemplary embodiment of the disclosure, the first plate (110) and the second plate (111) are configured as concentric plates. As shown in FIGS.4A and 4B the first plate (110) is configured with a plurality of first projections (116a) extending from upper surface and lower surface of the first plate (110). The plurality of first projections (116a) in the first plate (110) are spaced apart by a predetermined distance. Further, the second plate (111) comprises a plurality of second projections (116b) extending on either sides of the second plate (111). The plurality of second projections (116b) are arranged such that the predetermined distance between two adjacent first projections (116a) of the plurality of projections is occupied by the at least one second projection (116b). The magneto rheological fluid (113) is disposed in an annular gap between the plurality of first projections (116a) and the plurality of second projections (116b) [shown in FIG.4]. The magneto rheological fluid (113) when energised by an energiser coil (112) the fluid becomes viscoelastic solid [shown in FIG.4B], and brings physical contact between the plurality of first projections (116a) and the plurality of second projections (116b). This in-turn brings connection between the first plate (110) and the second plate (111) to transmit power from the first shaft (101) to the second shaft (104).

Referring now to FIG.5 which is an exemplary embodiment of the disclosure, illustrates a schematic block diagram of the gearbox with associated components of the vehicle. As shown in the FIG.5 the at least one magneto rheological clutch (108) associated with the plurality of driven gears (105 and 106) is interfaced with an Electronic Control Unit (ECU) (115). The ECU (115) is configured to receive the signal from at least one of switch, gear leaver and the like from the driver cabin, and accordingly regulate power supply to the magneto rheological clutch (108) for engaging corresponding gear of the gearbox (100). This facilitates semi-automatic operation of the gearbox (100) in the vehicle. It must be noted that the gear change can be effected either manually by receiving the input from the driver or one or more control units in the vehicle decide the optimal gear ratio based on the vehicles parameters like speed, load etc., and accordingly send signals to activate or deactivate one or more magneto rheological clutch (108) to obtain the required gear ratio.

In an embodiment of the present disclosure, a method of working of the magneto rheological clutch (108) is disclosed. When the driver or user of the vehicle tends to move the vehicle, the driver selects a particular gear through a switch or a gear lever (manual mode) or one or more electronic controllers (automatic mode) which sends signal to the ECU (115) to energize the at least one magneto rheological clutch (108) to activate the corresponding gear mounted on the second shaft (104). During such operation, a power source such as but not limiting to battery of a vehicle supplies necessary power to the energizer coil (112) housed in the casing (109). In an embodiment of the disclosure, the power source is interfaced with the ECU (115). The energizer once powered by the power source, generates magnetic flux in the casing (109) [as shown in FIG.4]. The generation of magnetic flux results in changes in properties of magneto rheological fluid (113) which gradually becomes a viscoelastic solid. This facilitates positive connection between the first plate (110) and the second plate (111), thereby transmits the torque or power from the first shaft (101) to the second shaft (104) and then to the wheels through the drive axles. In an embodiment of the disclosure the magneto rheological clutch (108) configured with the forward driven gears (105) facilitates forward motion of the vehicle and the magneto rheological clutch (109) configured with the reverse driven gear (106) facilitates reverse motion of the vehicle through the idler gear (107). Thus, the gearbox (100) can provide substantially uninterrupted flow of power from engine to the wheels thereby substantially improving fuel economy. As the magneto rheological clutch (109) performs all the functions of a traditional clutch, synchromesh units and selectors, there is no need of having these as separate entities. Thus, the gearbox (100) overcomes major disadvantages associated with an automatic epicyclic gear train and dual clutch transmissions. This reduces the overall mass of the transmission unit significantly and also eliminates the requirement of complex lubrication systems.

It is to be understood by a person of ordinary skill in the art would design the gearbox with any number of gears and the magneto rheological clutch can be provided in such gearbox assembly without deviating from the scope of the present disclosure. Also, various modifications and variations may be made without departing from the scope of the present disclosure. Therefore, it is intended that the present disclosure covers such modifications and variations provided.
It is to be noted that use of the gearbox as described in the present disclosure in vehicle is one of the exemplary embodiment, and one should not consider the same as only application of the gearbox, as the same can extended to other applications where gearbox is used.

Advantages:

The present disclosure provides a gearbox in which wear of mechanical components is eliminated, as the gearbox does not use separate clutches, synchronisers, shifter dogs/forks, thereby facilitate smooth flow of power without any interruption during gear shifts.

The present disclosure provides a gearbox in which the torque transmission will is simple and precise with the aid of electronic selection of the gears, thereby obviates the need for special hydraulic circuits.

The present disclosure provides a gearbox which is simple in construction, lightweight, easy for maintenance and also improves fuel economy in the vehicle.

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 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 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.”

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 Numerals:

Reference Number Description
100 Gearbox
101 First shaft
102 Forward driving gears
103 Reverse driving gear
104 Second shaft
105 Forward driven gears
106 Reverse driven gear
107 Idler
108 Magneto rheological clutch
109 Casing of the Magneto rheological clutch
110 First plate
111 Second plate
112 Energizer coil
113 Magneto rheological fluid
114 Housing of the gearbox
115 Electronic Control Unit (ECU) or Switch
116a First projections
116b Second projections
,CLAIMS:We claim:

1. A gearbox (100) for a vehicle comprising:
a first shaft (101) positioned in a housing (114) and is connectable to an output shaft of an engine, wherein the first shaft (101) accommodates a plurality of forward driving gears (102) and at least one reverse driving gear (103);
a second shaft (104) disposed parallel to the first shaft (101) in the housing (114), wherein the second shaft (104) accommodates a plurality of forward driven gears (105) and at least one reverse driven gear (106);
wherein, the second shaft (104) is positioned in the housing (114) such that the plurality of forward driven gears (105) on the second shaft (104) are in constant mesh with the plurality of forward driving gears (102) on the first shaft (101) and the at least one reverse driven gear (106) on the second shaft (104) is in constant mesh with the at least one reverse driving gear (103) on the first shaft (101) through an idler (107); and
at least one magneto rheological clutch (108) positioned adjacent to each of the forward driven gears (105) and the at least one reverse driven gear (106) on the second shaft (104), wherein each of the at least magneto rheological clutch (108) selectively engages a corresponding driven gear (105 and 106) with the second shaft (104) to transmit power from the first shaft (101) to the second shaft (104).

2. The gearbox (100) as claimed in claim 1, wherein the magneto rheological clutch (108) comprises:
a casing (109);
at least one first plate (110) positioned in the casing and is coupled to corresponding forward driven gear (105) and the at least one reverse driven gear (106);
at least one second plate (111) configured adjacent to the at least one first plate (110) in the casing (109), wherein the at least one second plate (111) is mounted on the second shaft (104);
an energizer coil (112) housed in the casing (109); and
a magneto rheological fluid (113) disposed in between the at least one first plate (110) and the at least one second plate (111).

3. The gearbox (100) as claimed in claim 2, wherein the energizer coil (112) is adapted to energise the magneto rheological fluid (113) to selectively couple the at least one second plate (111) and the at least one first plate (110) of the corresponding forward driven gears (105) and the at least one reverse driven gear (106) to transmit power from the first shaft (101) to the second shaft (104).

4. The gearbox (100) as claimed in claim 2, wherein the energizer coil (112) is an electromagnet.

5. The gearbox (100) as claimed in claim 2, wherein the energizer coil (112) is provisioned around the circumference of the first and second plates (110 and 111).

6. The gearbox (100) as claimed in claim 2, wherein the at least one first plate (110) and the at least one second plate (111) are arranged concentrically to each other.

7. The gearbox (100) as claimed in claim 6, wherein the magneto rheological fluid (113) is provisioned in annular gap between the concentric plates (110 and 111).

8. The gearbox (100) as claimed in claim 1, wherein each of the at least one magneto rheological clutch (108) is interfaced with an Electronic Control Unit (ECU) (115) of the vehicle.

9. The gearbox (100) as claimed in claim 8, wherein the ECU (115) is configured to selectively operate the magneto rheological clutch (108) of the corresponding forward driven gears (105) and the at least one reverse driven gear (106).

10. The gearbox (100) as claimed in claim 1, wherein each of the at least one magneto rheological clutch (108) is interfaced with a switch (115) for selectively operating the corresponding at least one magneto rheological clutch (108).

11. A vehicle comprising a gearbox (100) as claimed in claim 1.