Description:DRUM BRAKE SYSTEM WITH ELECTRIC PARKING BRAKE ACTUATOR AND METHOD THEREOF
FIELD OF INVENTION
The present invention relates to a brake system for automotive applications. More particularly, the present invention relates to a drum brake system with an electric parking brake actuator that ensures consistent and reliable brake engagement and disengagement and enhances the efficiency and performance of drum brake mechanisms. Advantageously, the present invention enhances safety and provides precise and responsive braking capabilities.
BACKGROUND OF THE INVENTION
A drum brake system is a type of braking system commonly used in vehicles to slow down or stop their motion. This braking mechanism operates through the interaction of friction between brake shoes and the inner surface of a drum-like component attached to the wheel. A drum brake operates by utilizing the friction generated when a set of shoes or pads exert pressure outwards against a rotating, cylinder-shaped component known as a brake drum. The term "drum brake" typically refers to a braking mechanism in which the shoes apply pressure to the inner surface of the drum. Drum brakes are primarily applied at the rear axle of small and compact vehicles.
As the brake pedal is pressed, the fluid in the master cylinder is compressed and the piston of the wheel cylinder is allowed to expand outward. The outward motion of the piston of the wheel cylinder forces the brake shoe outward against the brake drum. As the brake shoe lining touches the inner surface of the drum, and due to the friction generated between the brake shoe and drum, the motion of the wheel reduces, and the vehicle stops. As the force is removed from the brake pedal, the retracting springs draw the brake shoe inward and the contact between the friction lining and drum ends. Now the brake is ready to apply again. A self-adjusting screw is present at the bottom, which is used to maintain a minimum gap between the drum and brake shoe. When the lining of the brake shoe is worn out the gap between the drum and brake shoe increases, at that time the adjuster is adjusted again to maintain the minimum gap.
Conventionally, the parking brake is activated manually through the hand brake lever. The parking brake cable is connected to the parking brake lever and is connected to the hand brake lever which is normally inside the driver cabin through ratchet and pawl mechanism. Whenever the driver pulls the hand lever when the vehicle is in idle condition, the parking brake lever will be pulled which expands the brake assembly against the drum and holds the brake with the help of the ratchet and pawl mechanism, and when the driver releases the hand lever, the parking lever will retract back with the help of a return spring which will release the parking brake. With a manual parking brake, the user can directly engage the brakes on the rear wheels using a physical connection, which provides a strong and immediate response when the user needs to hold the vehicle in place, particularly on steep inclines. To overcome the above problem an electric parking brake is developed that uses electrical power to stop a vehicle and use an electric motor to generate the braking force.
Some of the prior arts are:
EP398546A2 discloses an Electrically actuated drum brake, this invention includes: an automotive vehicle drum brake (7) comprising a brake drum (10) for connection to the vehicle wheel; a backing plate (12) for connection to the vehicle; at least one brake shoe (20,21) pivotally mounted on the backing plate and engageable with the brake drum; a non-rotative nut (44) mounted for linear motion with respect to the backing plate and having means (52,62,64) of pivotal connection with the brake shoe; a power screw (40) threadably engaged with the nut, the power screw being mounted on the backing plate; and an electric motor (74) drivingly connected with the power screw to turn the same to actuate the drum brake.
US20110147143A1 discloses electronic parking brake actuator, this invention includes: an electronic parking brake actuator generating power for braking by using power from a motor, transmits the power from the motor to a caliper, stably and without noise, and ensures more quiet operability and durability by preventing and blocking noise and vibration generated by the actuator.
US20210394734A1 discloses an electronic parking brake system, which is configured to push the first and second brake shoes respectively disposed on inner opposite sides of a drum to an inner surface of the drum for braking, including an actuator including a motor configured to rotate forward and reverse to generate a driving force for braking, and a reduction gear unit configured to amplify the driving force transmitted from the motor, and a power converter configured to convert a rotational motion from the actuator into a linear motion to press or release the first and second brake shoes.
However, the conventional electrically actuated parking brake as discussed in the prior art requires specialized maintenance and repair which can be more expensive and requires greater control of the vehicle.
Accordingly, there is a need for an improved drum brake system with electric parking brake actuator which improves braking modulation and reduces response times, ensures consistent and reliable brake engagement, and allows for remote monitoring and adjustments contributing to simplified maintenance and diagnostics.
OBJECT OF THE INVENTION
The main objective of the present invention is to provide a drum brake system with an electric parking brake actuator that ensures consistent and reliable brake engagement and disengagement.
Another objective of the present invention is to provide a drum brake system with an electric parking brake actuator that generates different loads for various brake sizes.
Another objective of the present invention is to provide a drum brake system with an electric parking brake actuator to prevent the vehicle from rolling.
SUMMARY OF THE INVENTION
It is a primary aspect of the present invention to provide a drum brake system with electric parking brake actuator, comprising: a back plate (100), a brake shoes provided on the inner side of the back plate (100), an actuator holder (200), a parking lever (300), a control unit, and an actuator (400) comprising a top housing (1), a bottom housing (2), a bellow (3) with a bellow clip (4), lead screw (9) is inserted at a first end of a Bowden cable (9b), and a second end of the Bowden cable (9b) fixed with the end nut (11), a motor assembly (5) comprising a motor (5a), crossed angle pinion (5b) meshed with the crossed angled gear (8a) housed between the top bearing (8b) and the bottom bearing (8c), a radial clip (6) used to lock the motor (5a) radially on the motor housing (2a) of the bottom housing (2), a worm wheel assembly (8) comprising a worm wheel (8a), a top bearing (8b) and a bottom bearing (8c), a lead screw assembly (9) comprising a lead screw (9a) with lobe guider, Bowden cable (9b) assembled into crossed angle gear set (8), and a bearing holder (7), two or more screws (10), and an end nut (11) provides clamping force as the output, wherein the axis A1 of the spindle configuration is perpendicular to the axis A2 of the motor (5a), wherein the motor (5a) generates the rotational force that is transmitted through the crossed angled gear set (8) to convert into torque or load to actuate the drum brake, wherein an oil slinger (15) is configured to flings or throw oil outward from its surface and prevent the ingress of oil or grease or any other contamination particle from entering the motor (5a) during its rotation, wherein the actuator (400) is connected to the actuator holder (200) mounted on the back plate of the drum brake arresting all the degrees of freedom (DOF), and generates a clamp force, and wherein the Bowden cable (9b) from the actuator (400) passes through the back plate and is connected to the parking lever (300), and on activation the parking brake through a switch present in the interior of the vehicle, the actuator (400) is operated through electronic stability control that pulls the parking lever (300) through the Bowden cable (9b) that in turn pushes the brake lining against the drum and a parking brake is applied, and when driver presses the accelerator or the EPB switch is released, reverse operation in actuator occurs and the brake is released.
Another aspect of the present invention is to provide a method of controlling a drum brake system with an electric parking brake actuator, said method comprising:
a. activation of the parking brake by a parking brake switch fixed in the interior of the vehicle;
b. delivering the torque, by the motor (5a), which is stepped up using a crossed-angled gear train when at constant voltage is supplied to the motor (5a) by electronic stability control (ESC), which in turn provides an output torque till the set current in ESC is attained;
c. lifting the lead screw assembly, by output torque from the crossed-angled gear, fixed to the parking lever by the Bowden cable and the end nut;
d. Actuating and pulling the parking lever, by the actuator, which pushes the brake lining outward and applies the brake on the drum, which stops the movement of the vehicle, and
e. Pressing the accelerator or releasing the switch, by the driver, reverse operation in the actuator occurs and the brake is released.
BRIEF DESCRIPTION OF DRAWINGS
The embodiment of the present invention is illustrated with the help of accompanying drawings.
Figure 1 illustrates a view of a drum brake system with an electric parking brake actuator according to the present invention.
Figure 2 illustrates a detailed view of an electric parking brake actuator according to the present invention.
Figure 3 illustrates a view of the flange of the motor according to the present invention.
Figure 4 illustrates a view of an oil slinger according to the present invention.
Figure 5a illustrates a view of a motor bearing bosses according to the present invention.
Figure 5b illustrates a view of a V-shaped plastic clip according to the present invention.
Figure 6 illustrates a view of a bearing holder and radial mechanical stopper bearing bosses according to the present invention.
Figure 7 illustrates a view of a mounting threaded insert according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The present invention as embodied by “a drum brake system with electric parking brake actuator and method thereof” succinctly fulfills the above-mentioned need[s] in the art. The present invention has objective[s] arising as a result of the above-mentioned need[s], said objective[s] having been enumerated herein above.
The following description is directed to a drum brake system with an electric parking brake actuator and a method thereof as much as the objective(s) of the present invention are enumerated, it will be obvious to a person skilled in the art that, the enumerated objective(s) are not exhaustive of the present invention in its entirety and are enclosed solely for the purpose of illustration. Further, the present invention encloses within its scope and purview, any structural alternative(s) and/or any functional equivalent(s) even though, such structural alternative(s) and/or any functional equivalent(s) are not mentioned explicitly herein or elsewhere, in the present disclosure. The present invention therefore encompasses also, any improvisation[s]/modification[s] applied to the structural alternative[s]/functional alternative[s] within its scope and purview. The present invention may be embodied in other specific form[s] without departing from the essential attributes thereof.
Furthermore, the terms and phrases used herein are not intended to be limiting, but rather to provide an understandable description. Throughout this specification, the use of the word "comprise" and variations such as "comprises" and "comprising" may imply the inclusion of an element or elements not specifically recited.
The conventional electric parking brake actuator requires specialized maintenance and repair which can be more expensive and requires greater control of the vehicle. The present invention provides consistent and reliable brake engagement and allows for remote monitoring and adjustments contributing to simplified maintenance and diagnostics. The system incorporates various innovative features to efficiently engage and disengage the parking brake which is described in various embodiments provided below.
The present invention provides a drum brake system with an electric parking brake actuator that ensures consistent and reliable brake engagement and disengagement and enhances the efficiency and performance of drum brake mechanisms.
Referring to figure , in an embodiment of the present invention, provides a drum brake system with electric parking brake actuator, comprising: a back plate (100), a brake shoes provided on the inner side of the back plate (100), an actuator holder (200), a parking lever (300), a control unit, and an actuator (400) comprising a top housing (1), a bottom housing (2), a bellow (3) with a bellow clip (4)Lead screw (9a) is inserted at a first end of a Bowden cable (9b), and a second end of the Bowden cable (9b) fixed with the end nut (11), a motor assembly (5) comprising a motor (5a) and a crossed angled pinion (5b) meshed with the crossed angled gear (8a) housed between the top bearing (8b) and the bottom bearing (8c), a radial clip (6) used to lock the motor (5a) radially on the motor housing (2a) of the bottom housing (2), a crossed angled gear set (8) comprising a worm wheel (8a), a top bearing (8b) and a bottom bearing (8c), a lead screw assembly (9) comprising a lead screw (9a) with lobe guider, Bowden cable assembled into crossed angled gear set (8), and a bearing holder (7), two or more screws (10), and an end nut (11) provides clamping force as the output.
The axis A1 of the spindle configuration is perpendicular to the axis A2 of the motor (5a). The motor (5a) generates the rotational force that is transmitted through the crossed angled gear set (8) to convert into torque or load to actuate the drum brake.
An oil slinger (15) is configured to fling or throw oil outward from its surface and prevent the ingress of oil or grease or any other contamination particle from entering the motor (5a) during its rotation.
The actuator (400) is connected to the actuator holder (200) mounted on the back plate of the drum brake arresting all the degrees of freedom (DOF), and generates a clamp force.
The Bowden cable (9b) from the Actuator (400) passes through the back plate and is connected to the parking lever (300), and on activation the parking brake through a switch present in the interior of the vehicle, the actuator (400) is operated through electronic stability control that pulls the parking lever (300) through the Bowden cable (9b) that in turn pushes the brake lining against the drum and a parking brake is applied, and the when the driver presses the accelerator or the switch is released, reverse operation in actuator occurs and the brake is released.
In the preferred embodiment of the present invention, the actuator (400) is provided on the outer side of the back plate (100),
In the preferred embodiment of the present invention, the lead screw (9) crimped into the bowden cable (9b) and inserted into the bottom housing (2) to form an intact assembly.
In the preferred embodiment of the present invention, the oil slinger (15) is in a disc-shaped or cup-shaped component attached to the motor shaft.
In the preferred embodiment of the present invention, the top bearing (8b) is seated in the bearing holder (7) and crossed angled gear (9a) is configured to withstand the axial and radial load of the system when clamp force is released.
In the preferred embodiment of the present invention, the motor (5a) is oriented in the horizontal direction at an axis A2 parallel to the ground surface.
In the preferred embodiment of the present invention, the bottom bearing (8c) is seated in the bottom housing (2) and the lead screw (9a) is configured to withstand axial and radial load when clamp force is attained.
In the preferred embodiment of the present invention, the top housing (1) is provided with a guider dome (1a), and the rotation motion of the lead screw (9a) is converted to the translational force by arresting the yaw rotation freedom in the top housing (1), and the bottom housing (2) is provided with a motor housing (2a) where the both ends of the motor (5a) are securely affixed on it.
In the preferred embodiment of the present invention, the motor (5a) comprises a motor shaft that is rotationally fixed to the crossed angled pinion (5b).
In the preferred embodiment of the present invention, the crossed angled pinion (5b) and crossed angled gear (8) are used in the actuator to transmit the motion from non-intersecting shafts. The torque required for achieving the clamping force is amplified by using the gear train.
In the preferred embodiment of the present invention, two or more screws (10) are provided on the bearing holder (7).
In the preferred embodiment of the present invention, the radial clip (6) is a curved fashion that sits on the motor body and the leg of the radial clip (6) is v-shaped that acts as a spring element and provides unidirectional fitment into the slot in the bottom housing (2) and holds the motor (5a) intact with the bottom housing (2).
In the preferred embodiment of the present invention, the bottom housing (2) comprising motor bearing bosses (12) fixed rigidly in it by a v-shaped plastic clip (13) and an integral part of the bottom housing (2), to prevent the radial and axial movement of the motor (5a) and prevents the motor (5a) from disengaging due to high vibrations.
In the preferred embodiment of the present invention, the lead screw (9a) is provided with a radial mechanical stopper (16) to stop the lead screw (9a) movement radially & axially, and to set the home position in the actuator (400).
In the preferred embodiment of the present invention, the bearing holder (7) holds the top and bottom bearing (8b, 8c) or deep groove ball bearings fastened into the bottom housing (2) to form an intact assembly to avoid tilting the crossed angled gear set (8) and absorbs the thrust forces developed on the brake system when clamping force is attained.
In the preferred embodiment of the present invention, the bottom housing (2) comprising three or more mounting threaded inserts (14) rotationally conjoined in it in a triangular-shaped position to support the actuator (400) to the backplate (100) such that a uniform distribution of the forces is attained in case of vibration.
In the preferred embodiment of the present invention, the motor (5a) comprises a flange (5c) with projection and recess on the bottom housing (2) to prevent the rotation of the motor (5a).
In the preferred embodiment of the present invention, the control unit manages the operation of the motor (5a), thus allowing for seamless integration with vehicle control system, where said control unit executes a parking operation mode for engaging the electric drum brake by an operation signal of the parking switch operated by the driver or an operation signal generated by a program related to the operation of the electric drum brake or park release mode for disengagement.
In the preferred embodiment of the present invention, the crossed angled pinion (5b) and crossed angled gear (8) are used in the actuator (400) to transmit the motion from non-intersecting shafts. The torque required for achieving the clamping force is amplified by using the gear train.
In the preferred embodiment of the present invention, the bellow (3) is made up of rubber material is used to protect the actuator (400) from the ingress of water, dust, and other foreign particles and avoid the pressure gradient difference between the atmosphere and the actuator inside.
In the preferred embodiment of the present invention, the 3-start crossed angled pinion (5b) along with 14 Deg. crossed angled gear (8) with higher transmission efficiency is used in the electric parking brake Actuator to achieve the required torque as output for lifting the required clamp force.
The lead screw (9a) and crossed-angled gear (8) are formed as a unipartite by insert molding technology to make the lead screw (9a) and crossed-angled gear (8) rotate at the same torque.
Another embodiment of the present invention to provide a method controlling a drum brake system with electric parking brake actuator as claimed in claim, said method comprising:
a. activation of the parking brake by a parking brake switch fixed in the interior of the vehicle;
b. delivering the torque, by the motor (5a), which is stepped up using a worm wheel assembly when at constant voltage is supplied to the motor (5a) by electronic stability control (ESC), which in turn provides an output torque till the set current in ESC is attained;
c. lifting the lead screw assembly (9), by output torque from the crossed angled gear (8), fixed to the parking lever (300) by the bowden cable (9b) and the end nut (11);
d. actuating and pulling the parking lever (300), by the actuator (400), which pushes the brake lining outward and applies the brake on the drum, which stops the movement of the vehicle, and
e. pressing the accelerator or releasing the switch, by the driver, reverse operation in the actuator (400) occurs and the brake is released.

For Illustration:
WORKING
Electric parking brake:
The electric parking brake generates the clamp force using an Electric parking brake actuator (400) which is fastened to the Actuator holder (200) that is mounted on the back plate (100) of the drum brake arresting all the degrees of freedom (DOF). The bowden cable (9b) from the Actuator (400) passes through the back plate (100) and is connected to the parking brake lever (300). As soon as the driver activates the parking brake via a switch present in the interior of the car. The actuator (400) will be operated through electronic stability control that pulls the parking lever (300) via the bowden cable (9b) which in turn pushes the brake lining against the drum and a parking brake will be applied. When the Driver presses the Accelerator or releases the parking brake switch, reverse operation in the Actuator (400) occurs and the brake is released.

Electric parking brake Actuator:
When constant voltage is supplied to the DC motor (5a) by electronic stability control (ESC), the motor (5a) will deliver torque which is stepped up using a single stage crossed angled gear set (8), which in turn provides an output torque till the set current in ESC is attained. The output torque from the crossed-angle gear (8) lifts the lead screw assembly (9) which is fixed with the parking brake lever (300) by the bowden cable (9b) and the end nut (11). The actuator (400) actuates and pulls the lever (300) which pushes the brake lining outward and applies the brake on the drum, which stops the movement of the vehicle. However, the parking brake is released when the motor (5a) polarity is reversed.

ADVANTAGES OF THE PRESENT INVENTION
1. The present invention ensures consistent and reliable brake engagement, enhances safety and reduces wear on braking components.
2. The present invention allows for remote monitoring and adjustments, contributing to simplified maintenance and diagnostics.
3. The present invention provides precise and responsive braking capabilities.
It will be apparent to a person skilled in the art that the above description is for illustrative purposes only and should not be considered as limiting. Various modifications, additions, alterations, and improvements without deviating from the spirit and the scope of the invention may be made by a person skilled in the art.

List of Reference Numerals
(1) Top housing
(1a) Guider dome
(2) Bottom housing
(2a) Motor housing
(3) Bellow
(4) Bellow clip
(5) Motor assembly
(5a) Motor
(5b) Crossed angled pinion
(5c) Flange
(6) Radial clip
(7) Bearing holder
(8) Crossed angled gear assembly
(8a) Crossed angled gear
(8b) Top bearing
(8c) Bottom bearing
(9) Lead screw assembly
(9a) Lead screw
(9b) Bowden cable
(10) Screws
(11) End nut
(12) Motor bearing bosses
(13) V-shaped plastic clip
(14) Mounting threaded inserts
(15) Oil slinger
(16) Radial mechanical stopper
(100) Back plate
(200) Actuator holder
(300) Parking lever
(400) Actuator
(1000) Drum brake system
, Claims:WE CLAIM:
1. A drum brake system (1000) with electric parking brake actuator, comprising:
a. a back plate (100);
b. a brake shoes provided on the inner side of the back plate (100);
c. an actuator holder (200);
d. a parking lever (300);
e. a control unit, and
f. an actuator (400) comprising a top housing (1), a bottom housing (2), a bellow (3) with a bellow clip (4), a lead screw (9a) is inserted at a first end of a Bowden cable (9b), and a second end of the Bowden cable (9b) fixed with the end nut (11), a motor assembly (5) comprising a motor (5a) and a crossed angled pinion (5b) meshed with the crossed angled gear (8a) housed between a top bearing (8b) and a bottom bearing (8c), a radial clip (6) used to lock the motor (5a) radially on the motor housing (2a) of the bottom housing (2), a crossed angled gear set (8) comprising a crossed angled gear (8a), a top bearing (8b) and a bottom bearing (8c), a lead screw assembly (9) comprising the lead screw (9a) with lobe guider, Bowden cable assembled into crossed angled gear set (8), and a bearing holder (7), two or more screws (10), and an end nut (11) provides clamping force as the output,
wherein the axis A1 of the spindle configuration is perpendicular to the axis A2 of the motor (5a), wherein the motor generates the rotational force that is transmitted through the crossed angled gear set (8) to convert into torque or load to actuate the drum brake,
wherein an oil slinger (15) is configured to flings or throw oil outward from its surface and prevent the ingress of oil or grease or any other contamination particle from entering the motor during its rotation,
wherein the actuator (400) is connected to the actuator holder (200) mounted on the back plate of the drum brake arresting all the degrees of freedom (DOF), and generates a clamp force, and
wherein the Bowden cable (9b) from the Actuator (400) passes through the back plate and is connected to the parking lever (300), and on activation the parking brake through a switch present in the interior of the vehicle, the actuator (400) is operated through electronic stability control that pulls the parking lever (300) through the Bowden cable (9b) that in turn pushes the brake lining against the drum and a parking brake is applied, and the accelerator is pressed or the switch is released, reverse operation in actuator occurs and the brake is released.

2. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, wherein the actuator (400) is provided on outer side of the back plate (100),

3. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, a lead screw (9) crimped into the bowden cable (9b) and inserted into the bottom housing (2) to form an intact assembly.

4. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, wherein the oil slinger (15) is in a disc-shaped or cup-shaped component attached to the motor shaft.

5. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, wherein the top bearing (8b) is seated in the bearing holder (7) and crossed angled gear (9a) is configured to withstand the axial and radial load of the system when clamp force is released.

6. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, wherein the motor (5a) is oriented in the horizontal direction at an axis A2 parallel to the ground surface.

7. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, the bottom bearing (8c) is seated in the bottom housing (2) and the lead screw (9a) is configured to withstand axial and radial load when clamp force is attained.

8. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, wherein the top housing (1) is provided with a guider dome (1a), and the rotation motion of the lead screw (9a) is converted to the translational force by arresting the yaw rotation freedom in the top housing (1), and the bottom housing (2) is provided with a motor housing (2a) where both ends of the motor (5a) are securely affixed on it.

9. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, wherein the motor (5a) comprises a motor shaft is rotationally fixed to the crossed angled pinion (5b).

10. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, wherein two or more screws (10) are provided on the bearing holder (7).

11. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, wherein the radial clip (6) is a curved fashion that sits on the motor body and the leg of the radial clip (6) is v-shaped that acts as a spring element and provides unidirectional fitment into the slot in the bottom housing (2) and holds the motor (5a) intact with the bottom housing (2).

12. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, the bottom housing (2) comprising motor bearing bosses (12) fixed rigidly in it by a v-shaped plastic clip (13), and an integral part of the bottom housing (2), to prevent the radial and axial movement of the motor (5a) and prevents the motor (5a) from disengaging due to high vibrations.

13. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, the lead screw (9a) is provided with a radial mechanical stopper (16) to stop the lead screw (9a) movement radially & axially, and to set the home position in the actuator (400).

14. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, wherein the bearing holder (7) holds the top and bottom bearing (8b, 8c) or deep groove ball bearings fastened into the bottom housing (2) to form an intact assembly to avoid tilting the worm wheel assembly (8) and absorbs the thrust forces developed on the brake system when clamping force is attained.

15. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, the bottom housing (2) comprising three or more mounting threaded inserts (14) rotationally conjoined in it in a triangular-shaped position to support the actuator (400) to the backplate (100) such that a uniform distribution of the forces is attained in case of vibration.

16. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, the motor (5a) comprising a flange (5c) with projection and recess on the bottom housing (2) to prevent the rotation of the motor (5a).

17. The drum brake system (1000) with electric parking brake actuator as claimed in claim 1, wherein the control unit manages the operation of the motor (5a), thus allowing for seamless integration with vehicle control system, where said control unit executes a parking operation mode for engaging the electric drum brake by an operation signal of the parking switch operated by the driver or an operation signal generated by a program related to the operation of the electric drum brake or park release mode for disengagement.

18. A method of controlling a drum brake system with electric parking brake actuator as claimed in claim 1, said method comprising:
a. activation of the parking brake by a parking brake switch fixed in the interior of the vehicle;
b. delivering the torque, by the motor (5a), which is stepped up using a worm wheel assembly when at constant voltage is supplied to the motor (5a) by electronic stability control (ESC), which in turn provides an output torque till the set current in ESC is attained;
c. lifting the lead screw assembly (9), by output torque from the crossed angled gear (8), fixed to the parking lever (300) by the bowden cable (9b) and the end nut (11);
d. actuating and pulling the parking lever (300), by the actuator (400), which pushes the brake lining outward and applies the brake on the drum, which stops the movement of the vehicle, and
e. pressing the accelerator or releasing the switch, by the driver, reverse operation in the actuator (400) occurs and the brake is released.

Dated this 20th day of October, 2023 Kalyanchand Jhabakh (IN/PA-830)
Agent for Applicant