The present application does not claim priority from any patent application.
TECHNICAL FIELD
The present subject matter described herein, in general, relates to system and method for removal of air in service brakes fitted on axle of an Earth Moving Machinery.
BACKGROUND
Of late, Hydraulic braking systems are becoming more popular among recently manufactured equipment. These Hydraulic braking systems use brake fluid to transmit pressure energy from the controlling mechanism to the brake system of the vehicle. In conventional machines, the hydraulic braking system deployed in an Earth Moving Machinery such as Backhoe loader includes a brake pedal or brake lever, a push rod link (known as the actuating rod) having an end connected to the brake pedal, a brake master cylinder (filled with oil) having a piston assembly connected to other end of the actuating rod and a wet multiple disc brake chamber enclosed in the Axle housing.
It may be noted that the brake fluid is charged into brake lines by two ways,
1. Additional low capacity pump may be used to pump oil from master cylinder chamber to brake chamber in axle. But it incurs additional cost and hence is not viable.
2. Fill oil manually into master cylinder chamber and pedal till oil fills brake pipelines and then brake chamber in axle. In this case, the operator needs to do continuous pedaling for longer period and apply about 15 Kg effort, which is a tedious process.
When the brake pedal is pressed, the push rod exerts a force on the piston of the master cylinder (filled with oil) forcing the brake fluid to flow into the hydraulic lines of the braking system. This activity increases oil pressure in the brake lines forcing the piston against the disc plates in axle brake chamber and generating braking torque. When the brake pedal is released, the piston of the master cylinder retracts relieving the pressure on the piston in axle brake chamber, eventually separates disc plates and releasing braking force.
During the above process, if air is entrapped in the brake oil circuit which may happen if the braking system is not completely filled with brake oil, the driver may experience a spongy brake pedal sensation while applying the brakes. In such cases, depending on the

volume of air present in the braking system, the braking may become less effective resulting in unwanted movement of the equipment.
SUMMARY
Before the present system and method are described, it is to be understood that this application is not limited to the particular machine or an apparatus, and methodologies described, as there can be multiple possible embodiments that 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 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 a technology being implemented in a system for removal of air in service brakes fitted on axle of an Earth Moving Machinery and the aspects are further elaborated below in the detailed description. This summary is not intended to identify essential features of the proposed subject matter nor is it intended for use in determining or limiting the scope of the proposed subject matter.
In one implementation, a system for removal of air in service brakes fitted on axle of an Earth Moving Machinery is disclosed. More specifically, the system for removal of air in the service brakes is by charging oil to the service brakes and pressurizing the Brake chamber to the prescribed value. In order to remove the air from the service brakes, a hydraulic tank capable of storing hydraulic oil is used. The hydraulic tank may be electro-mechanically coupled with a hydraulic pump and the hydraulic pump may further be electro-mechanically coupled with a DC valve. A slide lock cylinder, coupled with the DC valve, having an outlet port connected to a Right Hand Side (RHS) master cylinder oil chamber and a Left Hand Side (LHS) master cylinder oil chamber through a hose using T adaptor.
A pressure gauge deployed on a RHS brake line and a LHS brake line, wherein the RHS brake line facilitating linkage between the RHS master cylinder oil chamber and a RHS brake chamber. The LHS brake line facilitating linkage between the LHS master cylinder oil chamber and a LHS brake chamber. A pair of transparent vinyl tube is connected to the RHS brake chamber and the LHS brake chamber facilitates removal of air in service brakes by actuating the hydraulic pump to pump the hydraulic oil from the hydraulic tank to slide lock cylinder which is then transmitted to fill the RHS brake chamber and the LHS brake chamber through the RHS master cylinder oil chamber and the LHS master cylinder oil chamber respectively. The hydraulic oil is transmitted through the pair of transparent vinyl tube. The

RHS master cylinder oil chamber and the LHS master cylinder oil chamber is further pressurized by pedaling a RHS brake pedal and a LHS brake pedal respectively until the hydraulic oil flows from the pair of transparent vinyl tube continuously without air bubbles.
BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing summary, as well as the following detailed description of embodiments, is better understood when read in conjunction with the appended drawings. 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 drawings:
The detailed process is described with reference to the accompanying figures. In the figures, 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 drawings to refer like features and components.
Figure 1 illustrates a schematic of Oil Charging of Brakes, in accordance with an embodiment of the present subject matter.
Figure 2 illustrates a process for brake oil charging, in accordance with an embodiment of the present subject matter.
The figures depict 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
Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising," "having," "containing," 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.
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.
To overcome the limitation observed in the conventional backhoe loader, the system facilitates removal of air in service brakes fitted on axle of an Earth Moving Machinery by charging oil to the service brakes. In other words, the objective of present invention is to establish a secured and effective process for oil charging and removal of air / moisture on service brakes fitted on rear axle of an Earth Moving Machinery for better reliability of braking system, reducing human effort and oil charging time. In one aspect, the Earth Moving Machinery is a Backhoe loader. It may be noted that the system is deployed at an axle of the Earth Moving Machinery.
Referring to figure 1 illustrating a schematic diagram of hydraulic schematic for oil charging of brakes is disclosed. As shown in the figure, the system comprises a hydraulic tank (1), a hydraulic pump (2). It may be noted that the hydraulic tank (1) capable of storing hydraulic oil which is same as that is used in hydraulic system i.e. SAE10W. In order to pump the hydraulic oil, the system further comprises the hydraulic pump (2) electro-mechanically coupled with the hydraulic tank (1). The hydraulic pump is further electro-mechanically coupled with a DC valve (5), as shown in the figure.
The system further comprises a slide lock cylinder (6) coupled with the DC valve, having an outlet port connected to a Right Hand Side (RHS) master cylinder oil chamber (8) and a Left Hand Side (LHS) master cylinder oil chamber (8) through a hose using T adaptor (14). In one aspect, the hose using T adaptor (14) facilitates connection between outlet port of the slide lock cylinder (6) with inlet port of the RHS master cylinder oil chamber (8) and the LHS master cylinder oil chamber (8). The system further comprises a pressure gauge (9) deployed on a RHS brake line and a LHS brake line. The RHS brake line facilitating linkage between the RHS master cylinder oil chamber (8) and a RHS brake chamber. The LHS brake line, on the other hand, facilitating linkage between the LHS master cylinder oil chamber (8) and a LHS brake chamber.

The system further comprises a pair of transparent vinyl tube (not shown in the figure) is connected to the RHS brake chamber and the LHS brake chamber. In one aspect, the pair of transparent vinyl tube may be connected to the RHS master cylinder oil chamber (8) and a RHS brake chamber respectively by removing bleeder screw (13) on axle using suitable adaptor.
In order to remove the air in service brakes by using the aforementioned components arranged in a manner as shown in figure 1, the operator has to actuate the engine and to be kept at low idle speed. Upon actuation of the engine, the hydraulic oil from hydraulic tank (1) is pumped by the hydraulic pump (2) to the DC valve (5). The hydraulic oil when pressurized by the actuation of the hydraulic pump (2), is directed towards the slide lock cylinder (6). The hydraulic oil is then transmitted from the slide lock cylinder (6) to fill the RHS brake chamber and the LHS brake chamber through the RHS master cylinder oil chamber (8) and the LHS master cylinder oil chamber (8) respectively. Once the RHS brake chamber and the LHS brake chamber are filled with the hydraulic oil, the operator pressurizes the RHS master cylinder oil chamber (8) and the LHS master cylinder oil chamber (8) by pedaling a RHS brake pedal and a LHS brake pedal respectively until the hydraulic oil flows from the pair of transparent vinyl tube continuously without air bubbles.
After continuous pedaling and monitoring of the air bubbles, the operator may remove the pair of transparent vinyl tube and close bleeder screws (13) and then the RHS master cylinder oil chamber (8) and the LHS master cylinder oil chamber (8) to ensure that oil pressure of a predefined limit is maintained. In one embodiment, the predefined limit is 40 Bar and maintained on the pressure gauge.
Though the system is specifically described for the backhoe loader, the system may also be implemented on vehicles where the common hydraulic oil is used in both main hydraulic system and brake lines. In specific it is applicable on all equipments fitted with hydraulically operated brakes using master cylinders connected with individual pedals.
Referring to figure 2. A process for brake oil charging is disclosed. At block 202, hydraulic oil is filled into Equipment work attachment to a hydraulic tank 1. At block 204, a slide lock cylinder (6) outlet port is connected to a Right Hand Side (RHS) master cylinder oil chamber (8) and a Left Hand Side (LHS) master cylinder oil chamber (8) through a hose using T adaptor (14). At block 206, the pressure gauge (9) connected to a RHS brake line and a LHS brake line to monitor the pressure of the hydraulic oil. At block 208, a pair of transparent

vinyl tube is connected to air bleeder screw points. Based on the aforementioned configuration, at block 210, engine of the Earth Moving Machinery is started and run it at low idle speed. At block 212, the hydraulic oil flows from the slide lock cylinder (6) to the RHS master cylinder oil chamber (8) and a LHS master cylinder oil chamber (8) and then to a RHS brake chamber and a LHS brake chamber present on axle. At block 214, the operator has to manually press the brake pedals for 1 to 2 minutes until continuously hydraulic oil flows in the pair of vinyl tube without any air bubbles, as stated at block 216. Once the hydraulic oil flows in the pair of vinyl tube without any air bubbles, remove hose connection and the pair of vinyl tube, as stated at block 218. Subsequently at block 220, close the RHS master cylinder oil chamber (8) and the LHS master cylinder oil chamber (8) with Air bleeder screws.
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.
The present system eliminates any entrapment of air or moisture in the brake lines.
The present system ensures prescribed Brake Pressure in the brake system, without using any additional source for oil charging.
The present system reduces oil charging time and human effort.
The present system prevents entry of air into brake system and minimizes oil wastage during air bleeding.

WE CLAIM:
1. A system for removal of air in service brakes fitted on axle of an Earth Moving
Machinery characterized by charging oil to the service brakes, the system comprising:
a hydraulic tank (1) capable of storing hydraulic oil, wherein the hydraulic tank (1) is
electro-mechanically coupled with a hydraulic pump (2), and wherein the hydraulic pump is
further electro-mechanically coupled with a DC valve (5);
a slide lock cylinder (6), coupled with the DC valve, having an outlet port connected to
a Right Hand Side (RHS) master cylinder oil chamber (8) and a Left Hand Side (LHS) master
cylinder oil chamber (8) through a hose using T adaptor (14);
a pressure gauge (9) deployed on a RHS brake line and a LHS brake line, wherein the
RHS brake line facilitating linkage between the RHS master cylinder oil chamber (8) and a
RHS brake chamber, and wherein the LHS brake line facilitating linkage between the LHS
master cylinder oil chamber (8) and a LHS brake chamber;
a pair of transparent vinyl tube is connected to the RHS brake chamber and the LHS
brake chamber facilitates removal of air in service brakes by,
actuating the hydraulic pump (2) to pump the hydraulic oil from the hydraulic tank (1) to slide lock cylinder (6) which is then transmitted to fill the RHS brake chamber and the LHS brake chamber through the RHS master cylinder oil chamber (8) and the LHS master cylinder oil chamber (8) respectively, wherein the hydraulic oil is transmitted through the pair of transparent vinyl tube, and wherein the RHS master cylinder oil chamber (8) and the LHS master cylinder oil chamber (8) are further pressurized by pedaling a RHS brake pedal and a LHS brake pedal respectively until the hydraulic oil flows from the pair of transparent vinyl tube continuously without air bubbles.
2. The system as claimed in claim 1 is deployed at an axle of the Earth Moving Machinery.
3. The system as claimed in claim 1 further comprises a hose using T adaptor (14), wherein the hose using T adaptor (14) facilitates connection between outlet port of the slide lock cylinder (6) with inlet port of the RHS master cylinder oil chamber (8) and the LHS master cylinder oil chamber (8).

4. The system as claimed in claim 1, wherein the pressure gauge (9) deployed on the RHS
brake line and the LHS brake line facilitates to maintain the hydraulic oil pressure of 40 Bar.