DESC:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
A DUAL BRAKE SYSTEM FOR A MOTOR GRADER

Applicant:
BEML Limited
A company Incorporated in India under the Companies Act, 1956
Having address:
BEML Soudha, 23/1, 4th Main,
Sampangirama Nagar, Bengaluru - 560 027,
Karnataka, India

The following specification particularly describes the invention and the manner in which it is to be performed

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present invention claims priority from Indian patent application numbered 202041006209 filed on 13 February 2020.

TECHNICAL FIELD
[002] The present invention relates to a dual brake system for a motor grader wherein the brake system is a full proof diagonal type air brake system. The brake system is equipped to control and stop a motor grader and further reduce the number of leakage joints in the air brake circuit.
BACKGROUND
[003] A typical motor grader comprises of hydraulically operated wet multiple disc brakes. The mechanical and power (Pneumatic / Hydraulic) type brake system are used in a motor grader due to its high operating mass. Due to more number of joints in such brake system and the number of components there is an increased possibility of air leak. Further, additional cooling system needs to be introduced in hydraulic brake system due to its higher generation of heat. Complexity of the system is high resulting in need of higher skill for maintenance and service.

OBJECT OF THE INVENTION
[004] Main object of the present invention is to apply dual brake system for a motor grader in construction equipment which use air operated and hydraulic brake system.
[005] Another object of the present invention is to reduce operator fatigue, complexity and cost on motor grader.
[006] Yet another object of the present invention is to eliminate requirement of unloader valve, condenser unit and automatic drain valve from the air brake system. .

SUMMARY
[007] Before the present dual brake system for a motor grader is described, it is to be understood that this application is not limited to the structure and methodologies described, as there can be multiple possible embodiments which are not expressly illustrated in the present disclosures. It is also to be understood that the terminology used in the description is for the purpose of describing the particular implementations or versions or embodiments only and is not intended to limit the scope of the present application. This summary is provided to introduce aspects related to dual brake system for a motor grader. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.
[008] In one implementation, dual brake system comprises is equipped to control and stop a motor grader while ensuring safety by two independent brake lines with diagonal type air brake system.
[009] The proposed air brake system reduces the number of leakage joints in the air brake circuit by eliminating the number of components in the system.

BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The foregoing summary, as well as the following detailed description of embodiments, is better understood when read in conjunction with the appended drawing. For the purpose of illustrating the disclosure, there is shown in the present document example constructions of the disclosure, however, the disclosure is not limited to the specific methods and apparatus disclosed in the document and the drawing:
[0011] The detailed description is described with reference to the accompanying figure. In the figure, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawing to refer like features and components.
[0012] Figure 1 illustrates a dual brake system for motor grader, in accordance with the subject disclosure.
[0013] Figure 2 illustrates a flow chart for dual brake for motor grader, in accordance with the subject disclosure.
[0014] The figure depicts various embodiments of the present disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following discussion 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
[0015] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising", “having”, and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. Although any systems and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, systems and methods are now described. The disclosed embodiments are merely exemplary of the disclosure, which may be embodied in various forms.
[0016] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure is not intended to be limited to the embodiments illustrated, but is to be accorded the widest scope consistent with the principles and features described herein.
[0017] Referring now to Figure 1, dual brake system for motor grader (100) is illustrated. The dual brake system comprises of a compressor (1) driven by the engine that delivers the compressed air to the system. The compressor is further connected an air dryer (12) which is a safety valve that releases the air to atmosphere when the system pressure reaches the predetermined pressure and removes the moisture in the compressed air. The main reservoir (4) stores the compressed air and delivers to the system. The distribution work and the system safety is ensured by the system protection valve (6). Two output lines of the protection valve (6) are directed to the slave servo (10,13) through two service reservoirs (7,8) respectively. Further, the air pressure is transferred as hydraulic oil pressure in slave servo (10,13) that supplies the oil to the wheel cylinders (11) at each tandem wheels.
[0018] In one embodiment, during the application of the wheel cylinder (11), the wheel cylinder (11) pushes the shoe brake pads inside the wheel drum. As brake pedal is released, due to the lack of pressure, brake pads are pushed to original position. Further, the oil returns to the slave servo (10,13).
[0019] In one embodiment, the dual brake system comprises of a compressor, air dryer, main reservoir, system protection valve, service reservoirs, dual brake valve, slave servo and wheel cylinder.
[0020] In one embodiment, an air dryer is introduced to eliminate condensator unit, un-loader valve and automatic drain valve in air operated internally expandable shoe brake system for motor grader
[0021] Referring to Figure 2, the figure illustrates a flow chart for dual brake system motor grader. In one embodiment, a compressor driven by Engine generates pressurized air (202). Further, the Air dryer removes the moisture contents and is a safety valve by maintaining system pressure (204), the main reservoir stores the compressed air (206). The system protection valve fitted with inbuilt non-return valves ensures system safety and supply air to parking brake line (208). Dual brake valve sends / cuts the air supply to slave servo based on the operator signal (210), Air pressure is transferred as hydraulic oil pressure in slave servo that supplies the oil to the wheel cylinders (212). Wheel cylinder pushes the shoe brake pads inside the wheel drum. As brake pedal is released, due to the lack of pressure brake pads are returned to original position by spring force and the oil returns to the slave servo (214).
[0022] A dual brake system for motor grader comprises of system protection valve (6) is configured to deliver air to service reservoirs (7,8). A dual brake valve (9) is configured to provide air to the slave servo (10,13) based on operator signal through service reservoir (7,8) respectively. The slave servo (10,13) are configured to actuate the hydraulic circuit by providing pressurized oil to wheel cylinders (11) for applying brakes. The system protection valve (6) is configured with inbuilt non-return valve to deliver air to service reservoir (7,8) and to ensure safety of system. The wheel cylinders (11) are configured to actuate the shoe brake pads inside the wheel drum for applying brakes. The pressure brake pads are configured to return to its original position by spring force on releasing of brake pedal by returning the oil to the slave servo (10,13). An air dryer (12) is configured to be connected to the outlet of compressor (1).
[0023] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include those provided by the following features.
[0024] Some object of the present invention is to eliminate requirement of unloader valve, condenser unit and automatic drain valve from the air brake system.
[0025] Some object of the present invention is to reduce operator fatigue, complexity and cost on motor grader.
[0026] Some object of the present invention is to apply dual brake system for a motor grader in construction equipment which use air and hydraulic operated brake system.

[0027] REFERRAL NUMERALS:
Element Description Reference Numeral
Compressor 1
Main reservoir 4
System protection valve 6
Service reservoir 7,8
Dual brake valve 9
Slave servo 10, 13
Wheel cylinder 11
Air dryer 12
Dual brake system for motor grader 100

,CLAIMS:
1. A dual brake system for motor grader comprising:
a compressor (1) configured to be driven by motor grader engine to deliver compressed air to brake system;
an air dryer (12) connected to the compressor (1) configured to release the excess air to atmosphere and remove the moisture from the compressed air;
a main reservoir (4) configured to store the compressed air and deliver it to the system;
a system protection valve (6) configured to deliver the air to the system ;
atleast one service reservoir (7,8) configured to receive air through system protection valve (6);
a dual brake valve (9) configured to receive air from service reservoir (7,8); and
atleast one slave servo (10,13) configured to receive air from service reservoir (7,8) to transfer air pressure into hydraulic pressure for applying brakes to motor grader

2. The dual brake system for motor grader as claimed in claim 1, wherein said system protection valve (6) is configured to deliver air to service reservoirs (7,8) .

3. The dual brake system for motor grader as claimed in claim 1, wherein said dual brake valve (9) is configured to provide air to slave servo (10,13) based on operator signal through service reservoir (7,8) respectively.

4. The dual brake system for motor grader as claimed in claim 1, wherein said slave servo (10, 13) are configured to actuate the hydraulic circuit by providing pressurized oil to wheel cylinders (11) for applying brakes.

5. The dual brake system for motor grader as claimed in claim 1, wherein said system protection valve (6) is configured with inbuilt non-return valve to deliver air to service reservoir (7,8) and to ensure safety of system.

6. The dual brake system for motor grader as claimed in claim 1, wherein said wheel cylinders (11) are configured to actuate the shoe brake pads inside the wheel drum for applying brakes.

7. The dual brake system for motor grader as claimed in claim 1, wherein the pressure brake pads are configured to return to its original position by spring force on releasing of brake pedal by returning the oil to the slave servo (10,13).

8. The dual brake system for motor grader as claimed in claim 1, wherein the said air dryer (12) is configured to be connected to the outlet of compressor (1).