Claims:1. A braking system for a dozer, the braking system comprising:
a brake pedal (9) is linked with a brake linkage (10), wherein the brake linkage (10) is further linked with a brake lever (11); and
a rod assembly (12) comprising a first end and a second end, wherein the first end is connected to a first lever (6), and wherein the second end is connected to the brake lever (11) thereby connected to the brake pedal (9), and wherein the rod assembly (12) facilitates reduction of engine Revolutions Per Minute (RPM) upon application of the brake pedal (9) by
pulling the rod assembly (12) inwardly towards a throttle (5) by the brake lever (11) as a result of an outward push received by the brake linkage (10),
pushing
the brake linkage (10) outwardly towards the throttle (5) by the brake pedal (9), and
a second lever (2), via the first lever (6), towards a Fuel Injection Pump (FIP) as a result of an inward pull received by the first lever (6) linked to the rod assembly (12), and wherein the second lever (2) is pushed to limit fuel flowing into the FIP, wherein the second lever (2) is pushed,
when the brake pedal (9) is pressed thereby bringing down the engine RPM below a predefined threshold.

2. The braking system of claim 1, wherein the second lever (2) is further connected to a FIP linkage (1) in order to reduce the fuel flowing to the FIP.

3. The braking system of claim 1, wherein the second end of the rod assembly (12) is connected to a yoke (13), and wherein the yoke (13) is connected to the brake lever (11).
, Description: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 BRAKING SYSTEM FOR A DOZER

Applicant:
BEML Limited
Beml Soudha, 23/1, 4th Main,
Sampangirama Nagar, Bengaluru,
Karnataka - 560 027, India

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

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present application does not claim priority from any patent application.

TECHNICAL FIELD
[002] The present subject matter described herein, in general, relates to braking system for a dozer. More specifically, the braking system for the dozer facilitating deceleration of engine Revolutions Per Minute (RPM) upon pressing of a brake pedal.

BACKGROUND
[003] In a conventional braking system for a dozer, when a brake is to be applied a driver needs to firstly press a deceleration pedal to reduce engine Revolutions Per Minute (RPM) of the dozer. Secondly after reducing the engine RPM, the driver may press a brake pedal for progressively bringing down the dozer on halt. It is to be noted that during emergency situation, the driver may press the brake pedal without first reducing the engine RPM. The sudden press of brake pedal at relatively high engine RPM damages brake bands of the braking system. The damage often leads to early wear and tear of the braking bands thereby reducing the life of the brake band.

SUMMARY
[004] 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 braking system for a dozer 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.
[005] In one implementation, a braking system for a dozer is disclosed. The braking system comprises a brake pedal and a rod assembly. The brake pedal may be linked with a brake linkage. In one aspect, the brake linkage may be further linked with a brake lever. The rod assembly may comprise a first end and a second end. In one aspect, the first end may be connected to a first lever and the second end may be connected to the brake lever thereby connected to the brake pedal. It is to be noted that the rod assembly may facilitate reduction of engine Revolutions Per Minute (RPM) upon application of the brake pedal by pulling the rod assembly inwardly towards a throttle by the brake lever as a result of an outward push received by the brake linkage. In an aspect, the brake linkage may be pushed outwardly towards the throttle by the brake pedal. Subsequently, a second lever, via the first lever, may be pushed towards a Fuel Injection Pump (FIP) as a result of an inward pull received by the first lever linked to the rod assembly. The second lever may be pushed to limit fuel flowing into the FIP when the brake pedal is pressed thereby bringing down the engine RPM below a predefined threshold.

BRIEF DESCRIPTION OF THE DRAWINGS
[006] 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:
[007] The detailed description 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.
[008] Figure 1 illustrates a schematic of a braking system, in accordance with an embodiment of the present subject matter.
[009] Figure 2 illustrates construction of the braking system for a bulldozer, in accordance with an embodiment of the present subject matter.
[0010] 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
[0011] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising" 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.
[0012] 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.
[0013] It has been noted that dozers typically operate at around 2000 to 3000 engine Revolutions Per Minute (RPM). Thus, in order to slowdown a dozer it is imperative to bring down the engine RPM between 1000 to 1100 RPM. The current systems and methodologies utilize a throttle lever configured to slow down the engine RPM. The deceleration pedal is an integral part of braking systems of dozers. The deceleration pedal controls fuel flowing to the Fuel Injection Pump (FIP) connected to the engine. Thus, when the deceleration pedal is pressed, the fuel flowing to the FIP is reduced thereby reducing the engine RPM. It is to be noted that the braking system of dozers comprises braking bands configured to clamp outer surface of brake drums in order to halt the dozer. The brake band is wet type with oil filled around the brake bands.
[0014] It has been noted that the braking bands undergo premature wear out when used at around 1500 to 2200 RPM. Thus, in order to overcome the premature wear out, the conventional systems and methodologies utilize the deceleration pedal to reduce the engine RPM before application of the brake. Thus, if a driver intends to slow down the dozer, the driver firstly needs to push the throttle lever such that the engine RPM is below a predefined threshold. Secondly, once the engine RPM is below the predefined threshold, the brake pedal is pressed to progressively halt the vehicle. This becomes a very tedious and fatigues task as the driver has to push the throttle as well as press the brake pedal for slowing down the dozer. However, during emergency panic situations the driver may not push the throttle lever before pressing the brake pedal leading to premature wear and tear of the braking bands. Thus, to obviate the premature wear and tear, present subject matter proposes a novel braking system for the dozer.
[0015] The present subject matter combines functioning of the deceleration pedal with the braking pedal. The braking system may comprise the braking pedal and a rod assembly to facilitate braking of the dozer. The rod assembly may be configured to limit the fuel flowing to a Fuel Injection Pump (FIP) thereby bringing down the engine RPM below a predefined threshold. Once the engine RPM is below the predefined threshold, the brakes may be applied.
[0016] Referring to figure 1 illustrating a schematic diagram of a braking system 100 for a dozer is disclosed. Example of the dozer include, but not limited to, a crawler dozer, an excavator, a loader, a forklift, a ditcher, a scrapper, and a grader. As shown in the figure, the braking system comprises a braking pedal 9, a deceleration pedal 8, a damper assembly rod 3, a rod assembly 12, a brake lever 11, a brake linkage 10, a first lever 6, a second lever 2, a Fuel Injection Pump (FIP) linkage 1, a yoke 13, and a throttle 5. The brake pedal 9 is linked with the brake linkage 10 and the brake linkage is further linked with the brake lever 11. It is to be noted that when the brake pedal 9 is pressed, the brake linkage 10 and brake lever 11 both are pushed outwardly towards the throttle 5. The rod assembly 12 comprises a first end and a second end. The first end is connected to the first lever 6 and the second end is connected to the brake lever 11. In an implementation, the second end may be connected to the yoke 13. The yoke 13 may further be connected to the brake lever 11. Thus, the second end may be connected to the brake lever 11.
[0017] In one embodiment, the rod assembly 12 facilitates reduction of engine Revolutions Per Minute (RPM) upon application of the brake pedal 9. In order to do so, the rod assembly 12 is pulled inwardly towards the throttle 5 by the brake lever 11. The inward pull from the brake lever 11 may be a result of an outward push received by the brake linkage 10. It is to be noted that the brake linkage 10 is pushed outwardly towards the throttle 5 by the brake pedal 9 when the brake pedal 9 is pressed. Subsequently, the second lever 2 is pushed towards the FIP by the first lever 6 as a result of an inward pull received from the first lever 6. In one aspect, the first lever 6 may receive an inward pull from the rod assembly 12.
[0018] It is to be noted that the second lever 2 is further connected to the FIP linkage 1. The second lever 2 is pushed to limit fuel flowing into the FIP. The FIP linkage 1 is configured to control the fuel flowing into the engine via the FIP. Thus, by controlling the FIP, the fuel flowing to the engine may be controlled thereby bringing down the engine RPM below a predefined threshold. In an example, the predefined threshold may be in the range of 1000 to 1100 engine RPM.
[0019] Once the engine RPM is below the predefined threshold, braking bands may clamp on outer surface of brake drums to gradually halt the dozer. It is to be noted that the braking system 100 automatically lowers down the engine RPM upon application of the brake pedal 9. The braking system 100 obviates the need of application of the deceleration pedal 8 and the throttle lever 5 before progressively bringing down the dozer to halt. It must be understood that the present system may be used in all types of conventional dozers with or without any changes and the concept may be tweaked to be used in other similar braking systems and vehicles.
[0020] In order to elucidate further now referring to Figure 2 illustrating construction of the braking system 200 for a bulldozer, in accordance with an embodiment of the present subject matter. The braking system 200 is mounted between an A-frame crossbar 204 and a brake crossbar 202. The brake crossbar 202 comprises a brake lever 234 mounted on top of the brake crossbar 202. The brake lever 234 is further connected to a brake pedal 208 by means of a brake linkage 236. The brake lever 234 comprises a clevis pin 210 and a brake lever assembly 212. The brake lever assembly 212 may be a ‘L’ shape part and is welded on the brake lever assembly 234. The braking system 200 further comprises a deceleration pedal 206 for reducing engine RPM by lowering down fuel flowing into a Fuel Injection Pump (FIP). The deceleration pedal 206 is connected to a first lever 222 by means of a deceleration linkage 238. The first lever 222 comprises a split pin 232 configured to fix a rod assembly 218.
[0021] The rod assembly 218 comprises a first end and a second end. The first end is connected to the first lever 222 by means of a spherical nut 228. The spherical nut 228 is engaged with the split pin 232 by using a slotted nut 224, and spacers 226 and 230. It is to be noted that the spherical nut 228 is connected with a threaded nut 220 attached to the rod assembly 218.
[0022] The second end is connected with a yoke 214. The yoke 214 is further connected to the brake lever assembly 212 with the help of the clevis pin 210 and a washer 216. The yoke 214 is further configured to ensure relative position of the deceleration pedal 206 and the brake pedal 208 as unchanged. In an embodiment, the yoke 214 facilitates independent operation of the brake pedal 208 and the deceleration pedal 206. It is to be noted that position of the yoke 214 and the rod assembly 218 is adjusted in a manner such that in the event of maximum braking, the engine RPM is reduced to around 1000 to 1100 RPM before applying brakes. Once the engine RPM is below the predefined threshold, the braking system 200 may slow down the dozer conventionally.
[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] The present system facilitates controlling of engine RPM through a brake pedal.
[0025] The present system ensures that the engine RPM is below a predefined threshold automatically without using the throttle lever or the deceleration pedal, upon pressing a brake pedal of a dozer.
[0026] The present system facilitates enhanced driver's comfort by reducing the driver's fatigue and improves durability of braking bands.
[0027] The present system helps in improving life of the braking bands by reducing the engine RPM automatically before application of the brake pedal.
[0028] The present system prevents premature wear and tear of braking bands thereby enhancing life of the braking bands.
[0029] The present system helps to control the equipment and can be brought to halt effectively during emergency.
[0030] The present system prevents the movement of equipment with Parking brake applied condition, as an additional safety feature.