FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION [See section 10; rule 13]
TITLE: “A DRUM BRAKE ASSEMBLY FOR A VEHICLE”
Name and Address of the Applicant:
TATA MOTORS LIMITED of 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
Present disclosure, in general, relates to the field of automobiles. Particularly, but not exclusively, the present disclosure relates to braking systems in automobiles. Further, embodiments of the present disclosure disclose magnetically actuated drum brake assembly for a vehicle.
BACKGROUND OF THE DISCLOSURE
Generally, vehicles are equipped with a drive train to drive the vehicle and braking systems for slowing or stopping movement of the vehicle in a controlled manner. A typical braking system includes a disc brake assembly or a drum brake assembly for each wheel of the vehicle to provide adequate stopping power. Typically, the drum brake assemblies are employed for vehicles including but not limited to small passenger vehicles, commercial vehicles, motorcycles and any other vehicle to provide the required braking force.
Conventional drum brake assemblies include a backing plate which is secured to a non-rotatable component of the vehicle, such as a vehicle axle housing or a steering knuckle. Further, a pair of opposed arcuate brake liners are supported on the backing plate for selective movement by an S-cam. The drum brake assembly further includes a cylindrical brake drum which is secured to the vehicle wheel for rotation therewith. The brake drum is disposed adjacent to the backing plate such that brake liners extend within an inner surface of the brake drum. Further, braking action is generated when the brake liners are displaced outwardly based on movement of the S-cam such that the brake liner frictionally engages the inner surface of the brake drum which causes slowing or stopping of the rotational movement of the brake drum and, therefore, the wheel of the vehicle.
With advancements in technology, actuating mechanisms are employed with
the drum brake assembly for selectively moving the brake liners outwardly apart from one another into frictional engagement with the inner surface of the brake drum. Generally, a hydraulic or pneumatic actuating mechanism is provided for selectively actuating the brake liner. Such actuating mechanisms include a hydraulic or pneumatic cylinder having a pair of opposed pistons which abut and displace the brake liners apart from one another into frictional engagement with the inner surface of the brake drum. Though conventional actuating mechanisms helps to reduce the efforts required for operating the drum brakes, such mechanism often pose certain challenges. One such challenge is that both hydraulic and pneumatic actuating mechanisms require a non-

compressible fluid for actuation and connecting hoses for channelizing the non-compressible fluids. Upon prolonged use, the hoses and the piston-cylinder arrangement may wear due to the high pressure exerted by the non-compressible fluid and may form cracks or break which causes the non-compressible fluid to leak and lead to irregular braking or brake failure. Further, when air is used as the non-compressible fluid, the air heats due to the high pressure and may increase the temperature of the surrounding components which may lead to decreased braking efficiency. Hence, the conventional actuating mechanisms require regular maintenance to ensure safe braking operation in the vehicle.
Additionally, the non-compressible fluids have to be drained out of the actuating mechanism after a predetermined time and fresh non-compressible fluids have to be filled back into the actuating mechanism. Further, the actuating mechanism has to be thoroughly primed which is a tedious process and generally requires skilled labor. Furthermore, the conventional hydraulic actuating mechanism have to be free of air bubbles, in the actuating mechanism which restrict channelization of the fluids. Also, the air bubbles may prevent pressure build up in the actuating mechanism that is required for actuating the brake liners. Moreover, the hydraulic and pneumatic actuating mechanism involves complex construction which leads to high manufacturing costs and high service time.
The present disclosure is directed to overcome one or more limitations stated above or any other limitations associated with the conventional braking system.
SUMMARY OF THE DISCLOSURE
One or more shortcomings of the prior art are overcome by an assembly as claimed and additional advantages are provided through the 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 present disclosure a drum brake assembly for a vehicle is disclosed. The assembly includes a back plate mounted on a shaft of the vehicle, where the back plate is defined with a provision to accommodate the shaft and a casing extending around the shaft.

At least one bipolar electromagnet is disposed on the casing, on either side of a central vertical axis of the back plate. Further, the assembly includes a plurality of magnetic engaging members, where each of the plurality of magnetic engaging members is connectable at one end to at least one brake liner provisioned at a periphery of the back plate, and other end of each of the plurality of magnetic engaging members is disposed proximal to a corresponding at least one bipolar electromagnet. The at least one bipolar electromagnet is configured to change polarity based on actuation of a brake pedal to selectively repel and attract the plurality of magnetic engaging members resulting in displacement of each of the at least one brake liner between a retracted condition and a braking condition.
In an embodiment, each of the plurality of magnetic engaging members is made of a permanent magnet.
In an embodiment, the assembly includes a brake drum rotatably disposed on the shaft and configured to enclose the back plate.
In an embodiment, the at least one bipolar electromagnet is electrically coupled to a power source, the power source is configured to energize the at least one bipolar electromagnet.
In an embodiment, the assembly comprises a control unit communicatively coupled to the power source and the at least one bipolar electromagnet, wherein the control unit is configured to control charge supplied to the at least one bipolar electromagnet based on actuation of the brake pedal.
In an embodiment, the at least one bipolar electromagnet is magnetized to a first polarity upon actuation of the brake pedal. The at least one bipolar electromagnet when magnetized to the first polarity repels the plurality of magnetic engaging members to displace the at least one brake liner from the retracted condition to the braking condition.
In an embodiment, the at least one bipolar electromagnet is magnetized to a second polarity upon de-actuation of the brake pedal. The at least one bipolar electromagnet when magnetized to the second polarity attracts the plurality of magnetic engaging members to displace the at least one brake liner from the braking condition to the retracted condition.

In an embodiment, the assembly includes at least one resilient member disposed on either side of the central vertical axis of the back plate and connectable to the at least one brake liner, wherein the at least one resilient member is configured to bias the at least one brake liner to the braking condition when the at least one bipolar electromagnet is de-magnetized. Further, the at least one resilient member is connectable to a support member extending on either side of the central vertical axis of the back plate.
In an embodiment, the assembly includes a linkage assembly configured to movably connect either ends of each of the at least one brake liner to the back plate.
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
The novel features and characteristics 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 embodiments 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:
Figs. 1 illustrates a schematic view of a drum brake assembly for a vehicle, in accordance with an embodiment of the present disclosure.
Fig. 2 is a block diagram illustrating connection of the at least one bipolar electromagnet with a power source (11).
Fig. 3a illustrates a schematic view of at least one bipolar electromagnet and a plurality of magnetic engaging members of the drum brake assembly of Fig. 1, in a braking condition, in accordance with an embodiment of the present disclosure.

Fig. 3b illustrates a schematic view of the at least one bipolar electromagnet and the plurality of magnetic engaging members of the drum brake assembly of Fig. 1, in a retracted condition, in accordance with 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 system and method 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 embodiments disclosed may be readily utilized as a basis for modifying other assemblies, mechanisms, systems, devices, methods, and processes 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 as set forth in the appended claims. The novel features which are believed to be characteristics of the disclosure, to its system, 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.
The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a non¬exclusive inclusions, such that a mechanism, a system, or a device that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or method. In other words, one or more elements in a system or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.

In accordance with various embodiments of the present disclosure, a drum brake assembly for a vehicle is disclosed. The assembly includes a back plate mounted on a shaft of the vehicle, where the back plate is defined with a provision to accommodate the shaft and a casing extending around the shaft. At least one bipolar electromagnet is disposed on the casing, on either side of a central vertical axis of the back plate. Further, the assembly includes a plurality of magnetic engaging members, where each of the plurality of magnetic engaging members is connectable at one end to at least one brake liner provisioned at a periphery of the back plate, and other end of each of the plurality of magnetic engaging members is disposed proximal to a corresponding at least one bipolar electromagnet. The at least one bipolar electromagnet is configured to change polarity based on actuation of a brake pedal to selectively repel and attract the plurality of magnetic engaging members resulting in displacement of each of the at least one brake liner between a retracted condition and a braking condition. As the assembly of the present disclosure employs magnetic force for actuating the brake liners, the braking efficiency remains constant even after prolonged use. Further, the assembly eliminates the use of hydraulic or pneumatic mechanism and thereby reduces complexity and the maintenance required to maintain the required braking efficiency.
Reference will now be made to the exemplary embodiments of the disclosure, as illustrated in the accompanying drawings. Wherever possible, same numerals have been used to refer to the same or like parts. The following paragraphs describe the present disclosure with reference to Figures 1-3. It is to be noted that the drum brake assembly may be employed in any vehicle including but not limited to a passenger vehicle, a utility vehicle, commercial vehicles, motorcycles, and any other vehicle.
Fig. 1 is an exemplary embodiment of the present disclosure which illustrates a drum brake assembly (100) for a vehicle. The drum brake assembly (100) [hereafter referred to as assembly (100)] may be provided for each wheel or some of the wheels of the vehicle. The assembly (100) may include a back plate (2) mounted on a shaft (S). The back plate (2) may be defined with a casing, where the casing may be adapted to cover the shaft (S) of the vehicle. In an embodiment, the shaft (S) may be including but not limited to an axle, a rotating member, a non-rotating member or any other member capable of connecting to the wheel of the vehicle. Further, the back plate (2) may be defined with a provision (3) at the center to accommodate the shaft (S) and the casing may

be defined on the periphery of the provision (3). The provision (3) and the casing enables the back plate (2) to be rigidly fixed over the shaft (S) such that the back plate (2) remains stationary when the wheel mounted on the shaft (S) rotates. In an embodiment, a bearing may be disposed in the provision (3) such that the back plate (2) may be directly mounted on the shaft (S) of the vehicle. The provision (3) and the casing may be defined with a profile including but not limited to circle, rectangle, triangle, and any other shape as per the shape of the shaft (S). Further, a brake drum (1) may be rotatably disposed on the shaft (S) and may be configured to enclose the back plate (2). An outer surface of the brake drum (1) may be configured to receive the wheel of the vehicle.
Further, the assembly (100) may include at least one bipolar electromagnet (4) that may be disposed on the casing defined on the periphery of the provision (3) on either side of a central vertical axis (A-A) of the back plate (2). In an embodiment, the at least one bipolar electromagnet (4) may be disposed proximal to the provision (3) defined in grooves, slots, indents, or any other means defined on the back plate (2) capable of supporting the at least one bipolar electromagnet (4). The at least one bipolar electromagnet (4) may be capable of generating a magnetic field by passage of electric current. The at least one bipolar electromagnet (4) may consist of a wire or any other electric conductor wound into a coil, such that electric current passing through the wire may generate the magnetic field. The wire or any other electric conductor may be wound around a core made of a non-magnetic material or at least one of a ferromagnetic and a ferrimagnetic materials which is known in the art. The magnetic field may be selectively generated by the at least one electromagnet based on supply of electric current, for example, the magnetic field may be generated and de-generate by transmitting and halting passage of electric current, respectively. Additionally, the at least one bipolar electromagnet (4) may be configured to selectively interchange magnetic poles. In an embodiment, the magnetic poles of the at least one bipolar electromagnet (4) may be interchanged by controlling the amount of electric current through the at least one bipolar electromagnet (4) and interchanging the direction of flow of electric current through the at least one bipolar electromagnet (4).
In the illustrative embodiment, four bipolar electromagnets (4) may be disposed on the back plate (2), however, such illustration should not be considered as a limitation, as more than or less than four of such bipolar electromagnets (4) may be disposed on the back plate (2). The at least one bipolar electromagnet (4) may be disposed such that a minimum of one bipolar electromagnet (4)

may be disposed on either side of the central vertical axis (A-A) of the back plate (2). Referring now to Fig. 2, the at least one bipolar electromagnet (4) may be electrically coupled to a power source (11) in the vehicle, which may be configured to energize the at least one bipolar electromagnet (4) to generate the magnetic field. Additionally, the electric current supplied by the power source (11) may be controlled by a control unit (CU) communicatively coupled to the power source (11) and the at least one bipolar electromagnet (4). In an embodiment, the control unit (CU) may be configured to operate based on operational signals which may be transmitted upon actuation and de-actuation of a brake pedal (12) of the vehicle. For example, the control unit (CU) may be configured to control amount of charge supplied to the at least one bipolar electromagnet (4) based on actuation of the brake pedal (12) and thereby control the magnetic field and the magnetic polarity of the at least one bipolar electromagnet (4). The control unit (CU) may be configured to selectively magnetize the at least one bipolar electromagnet (4) to a first polarity upon actuation of the brake pedal (12) [as seen in Fig. 3a] and similarly magnetize the at least one bipolar electromagnet (4) to a second polarity upon de-actuation of the brake pedal (12) [as seen in Fig. 3b].
In an embodiment, the control unit (CU) may be coupled to at least one sensor or switch associated with the brake pedal (12) of the vehicle. The at least one sensor or switch may be configured to transmit operational signals to the control unit (CU) based on the actuation and de-actuation of the brake pedal (12).
The back plate (2) may be further configured to movably accommodate at least one brake liner (6) provisioned at a periphery of the back plate (2) on either side of the central vertical axis (A-A). Either ends of the at least one brake liner (6) may be movably connected to a linkage assembly. The linkage assembly includes at least one link (9) connected at one end to the back plate (2) and to the at least one brake liner (6) at the other end. The other end of the at least one link (9) may be defined with an elongated hole to receive a connecting portion of the at least one brake liner (6). The elongated profile of the elongated hole permits displacement of the connecting portion thereby permitting displacement of the at least one brake liner (6) between a retracted condition and a braking condition. The at least one brake liner (6) in the retracted condition may be positioned along or within the periphery of the back plate (2). Further, the at least one brake liner (6) in the

braking condition may be displaced towards an inner surface of the brake drum (1) in order to frictionally engage with the inner surface of the brake drum (1).
In an embodiment, the one end of the at least one link (9) may be connected to a connecting member (10) defined on the back plate (2). The connecting member (10) may be including but not limited to a protrusion, a bar fixed on the back plate (2), a groove and any other rigid member capable of rigidly securing the at least one link (9). Further, the connecting member (10) may be defined with an S shaped profile resembling an S-cam that may be pivotally connected to the back plate (2) and may be configured to pivot for operating the at least one brake liner (6). In an embodiment, the connecting member (10) may spring loaded or may accommodate a spring for connecting the at least one link (9). Additionally, the at least one link (9) may be defined with elongated holes at either ends and may be adapted to connect at least two brake liners (6) together for synchronized actuation during braking.
The assembly (100) may include a plurality of magnetic engaging members (5). Each of the plurality of magnetic engaging members (5) may be connectable at one end to the at least one brake liner (6) and an other end of each of the plurality of magnetic engaging members (5) may be disposed proximal to a corresponding at least one bipolar electromagnet (4). In an embodiment, each of the plurality of magnetic engaging members (5) may be disposed proximal to an individual bipolar electromagnet (4) of the at least one bipolar electromagnet (4). The plurality of magnetic engaging members (5) may be movably accommodated in a plurality of grooves [not shown] defined on the back plate (2). Each of the plurality of magnetic engaging members (5) may be accommodated in a corresponding groove of the plurality of grooves. The plurality of grooves may be defined between the at least one bipolar electromagnet (4) and the at least one brake liner (6) such that the plurality of magnetic engaging members (5) may be displaced relative to the at least one bipolar electromagnet (4). Additionally, the plurality of magnetic engaging members (5) may be made of a permanent magnet defined with fixed magnetic poles.
In an embodiment, the plurality of magnetic engaging members (5) may be disposed on the back plate (2) such that the other end of each of the plurality of magnetic engaging members (5) proximal to the at least one bipolar electromagnet (4) may be defined with the magnetic polarity similar to the first polarity of the at least one bipolar electromagnet (4) and opposite to the second

polarity of the at least one bipolar electromagnet (4). For example, as seen in Fig. 3a, the magnetic pole of the plurality of magnetic engaging members (5) at the other end may be similar to the magnetic pole of the at least one bipolar electromagnet (4) at a free end when the at least one bipolar electromagnet (4) is energized to the first polarity. Further, as seen in Fig. 3b, the magnetic pole of the plurality of magnetic engaging members (5) at the other end may be opposite to the magnetic pole of the at least one bipolar electromagnet (4) at the free end when the at least one bipolar electromagnet (4) is energized to the second polarity. The at least one bipolar electromagnet (4) may be configured to repel the plurality of magnetic engaging members (5) when energized to the first polarity [as seen in Fig. 3a] such that the plurality of magnetic engaging members (5) may displace away from the at least one bipolar electromagnet (4) and in-turn displace the at least one brake liner (6) from the retracted condition to the braking condition. In the braking condition, the at least one brake liner (6) frictionally contacts the inner surface of the brake drum (1) and may generate a frictional force for braking. Furthermore, the at least one bipolar electromagnet (4) may be configured to attract the plurality of magnetic engaging members (5) when energized to the second polarity [as seen in Fig. 3b] such that the plurality of magnetic engaging members (5) may displace towards the at least one bipolar electromagnet (4) and in-turn displace the at least one brake liner (6) from the braking condition to the retracted condition. In the retracted condition, the at least one brake liner (6) may contact the inner surface of the brake drum (1) and may allow free rotation of the brake drum (1) and in turn the wheel of the vehicle.
In an embodiment, the control unit (CU) may be a centralized control unit (CU) of the vehicle or may be a dedicated control unit (CU) to the assembly (100) associated with the centralized control unit (CU) of the vehicle. The control unit (CU) may also be associated with other control unit (CU)s including, but not limited to, a body control module (BCM), a central control module (CCM), a general electronic module (GEM), and the like. In an embodiment, the control unit (CU) may include a processing unit, where the processing unit may comprise at least one data processor for executing program components for executing user- or system-generated requests. The processing unit may be a specialized processing unit such as integrated system (bus) controllers, memory management control unit (CU)s, floating point units, graphics processing units, digital signal processing units, etc. Further, the control unit (CU) may be an electronic control unit (CU), disposed in communication with one or more memory devices (e.g., RAM, ROM etc.) via a storage

interface. The storage interface may connect to the memory devices including, without limitation, memory drives, removable disc drives, and the like, employing connection protocols such as serial advanced technology attachment (SATA), integrated drive electronics (IDE), IEEE-1394, universal serial bus (USB), fiber channel, small computing system interface (SCSI), etc.
In an embodiment, the at least one sensor or the switch may be including but not limited to a proximity sensor, a load sensor, a relay circuit, and any other device capable of detecting actuation and de-actuation of the brake pedal (12). Further, the at least one sensor or the switch may detect the intensity and the amount of actuation of the brake pedal (12) such that a corresponding operational signal may be transmitted to the control unit (CU) to vary the electric current supplied to the at least one bipolar electromagnet (4) and thereby vary the intensity of magnetization for partial braking conditions. Further, the at least one sensor or switch may be provisioned with devices including but not limited to brake levers, buttons, knobs, and any other device capable of being employed to actuate the brake of the vehicle.
Additionally, the assembly (100) may include at least one resilient member (8) that may be disposed on either side of the central vertical axis (A-A) of the back plate (2). The at least one resilient member (8) may be connectable to the at least one brake liner (6), such that the at least one brake liner (6) may be biased towards the inner surface of the drum (1). The at least one resilient member (8) may be connectable to a support member (7) extending on either side of the central vertical axis (A-A) of the back plate (2). In an embodiment, the support member (7) may be including but not limited to a protrusion, a bar fixed on the back plate (2), a groove and any other rigid member capable of rigidly securing the at least one resilient member (8). Biasing of the at least one brake liner (6) towards the inner surface of the drum (1) ensures that the brake is applied to the wheels of the vehicle when the vehicle is in an OFF condition and the at least one bipolar electromagnet (4) is de-energized. The resilient member (8) provides automatic parking brake or hand brake, as the at least one brake liner (6) may be biased to the inner surface of the brake drum (1) as soon as the vehicle is operated to the OFF condition. Further, upon operating the vehicle to an ON condition, the control unit (CU) supplies electric current from the power source (11) to the at least one bipolar electromagnet (4) and magnetizes the at least one bipolar electromagnet (4) to the second polarity. The magnetic force between the at least one bipolar electromagnet (4) and the plurality of magnetic engaging members (5) overcome the biasing force

of the at least one resilient member (8) to displace the at least one brake liner (6) from the braking condition to the retracted condition.
In an embodiment, the power source (11) may be including but not limited to a battery of the vehicle, current supplied from an alternator and any other device capable of supplying electric current to the at least one bipolar electromagnet (4).
In an embodiment, the plurality of magnetic engaging members (5) may be defined with an elongated profile having cross-sectional shape including but not limited to a circular profile, a rectangular profile, and any other shape. Additionally, the plurality of magnetic engaging members (5) may be defined with a profile resembling a connecting rod that may be rigid to support the at least one brake liner (6). Further, a free end of the at least one bipolar electromagnet (4) and the other end of each of the plurality of magnetic engaging members (5) proximal to the at least one bipolar electromagnet (4) may be defined with a profile having large surface area such that the magnetic field generated may cover a larger area to facilitate strong attractive and repulsion forces.
In an embodiment, the brake assembly (100), the control unit (CU), the at least one sensor and the power source (11) may be connected with each other through transmission devices such as but not limited to wires, cables, and any other device capable of transmitting electrical signals. For example, the brake assembly (100), the control unit (CU), the at least one sensor and the power source (11) may be connected by a controller area network (CAN bus) and a CAN bus protocol may be employed for transmission of electrical signals or current.
In an embodiment, the at least one link (9) may be defined with, including but not limited to a rectangular profile, a circular profile, an S-cam profile, and any other intricate profile based on connection requirements, space availability, movement, and the like. Further, the at least one link may be made of a flexible or a rigid material.
In an embodiment, the assembly (100) provides precise and accurate braking force even after prolonged usage as there is no wear and tear like in conventional braking systems.

In an embodiment, the assembly (100) may include elements which are easy to manufacture and maintain. Furthermore, as the assembly (100) is operated electrically, the size and weight of the braking system may be reduced.
In an embodiment, the efficiency of the assembly (100) remains constant as electric current is employed for actuating the brakes.
It should be imperative that the construction and configuration of the assembly and any other elements or components described in the above detailed description should not be considered as a limitation with respect to the figures. Rather, variation to such structural configuration of the elements or components should be considered within the scope of the detailed description.
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.”
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 Numerals:

Reference Number Description
100 Assembly
1 Brake drum
2 Back plate
3 Provision
4 Bipolar electromagnet
5 Magnetic engaging members
6 Brake liner
7 Support member
8 Resilient member
9 Link
10 Connecting member
11 Power source
12 Brake pedal
13 Casing
CU Control unit
S Shaft

We Claim:
1. A drum brake assembly (100) for a vehicle, the assembly (100) comprising:
a back plate (2) mounted on a shaft (S) of the vehicle, wherein the back plate (2) is defined with a provision (3) to accommodate the shaft (S) and a casing extending around the shaft (S);
at least one bipolar electromagnet (4) disposed on the casing on either side of an central vertical axis (A-A) of the back plate (2); and
a plurality of magnetic engaging members (5), each connectable at one end to at least one brake liner (6) provisioned at a periphery of the back plate (2), and other end of each of the plurality of magnetic engaging members (5) is disposed proximal to a corresponding at least one bipolar electromagnet (4); and
wherein, the at least one bipolar electromagnet (4) is configured to change polarity based on actuation of a brake pedal (12) to selectively repel and attract the plurality of magnetic engaging members (5) resulting in displacement of each of the at least one brake liner (6) between a retracted condition and a braking condition.
2. The assembly (100) as claimed in claim 1, wherein each of the plurality of magnetic engaging members (5) is made of a permanent magnet.
3. The assembly (100) as claimed in claim 1 comprises a brake drum (1) rotatably disposed on the shaft (S) and configured to enclose the back plate (2).
4. The assembly (100) as claimed in claim 1, wherein the at least one bipolar electromagnet (4) is electrically coupled to a power source (11), the power source (11) is configured to energize the at least one bipolar electromagnet (4).
5. The assembly (100) as claimed in claim 4, comprises a control unit (CU) communicatively coupled to the power source (11) and the at least one bipolar electromagnet (4), wherein the control unit (CU) is configured to control charge supplied to the at least one bipolar electromagnet (4) based on actuation of the brake pedal (12).

6. The assembly (100) as claimed in claim 4, wherein the at least one bipolar electromagnet (4) is magnetized to a first polarity upon actuation of the brake pedal (12).
7. The assembly (100) as claimed in claim 6, wherein the at least one bipolar electromagnet

(4) when magnetized to the first polarity repels the plurality of magnetic engaging members
(5) to displace the at least one brake liner (6) from the retracted condition to the braking condition.

8. The assembly (100) as claimed in claim 4, wherein the at least one bipolar electromagnet (4) is magnetized to a second polarity upon de-actuation of the brake pedal (12).
9. The assembly (100) as claimed in claim 8, wherein the at least one bipolar electromagnet (4) when magnetized to the second polarity attracts the plurality of magnetic engaging members (5) to displace the at least one brake liner (6) from the braking condition to the retracted condition.
10. The assembly (100) as claimed in claim 1, comprises at least one resilient member (8) disposed on either side of the central vertical axis (A-A) of the back plate (2) and connectable to the at least one brake liner (6), wherein the at least one resilient member (8) is configured to bias the at least one brake liner (6) to the braking condition when the at least one bipolar electromagnet (4) is de-magnetized.
11. The assembly (100) as claimed in claim 10, wherein the at least one resilient member (8) is connectable to a support member (7) extending on either side of the central vertical axis (A-A) of the back plate (2).
12. The assembly (100) as claimed in claim 1, comprises a linkage assembly configured to movably connect either ends of each of the at least one brake liner (6) to the back plate (2).
13. A vehicle comprising a drum brake assembly (100) as claimed in claim 1.