DESC:DESCRIPTION
A MODULAR AXLE WITH FOUR PLANETARY FINAL DRIVE SYSTEM WITH BOLT ON TYPE RIM
FIELD OF INVENTION
[001] The present invention in general relates to power train in a dump truck. In particular, the present invention relates to a modular axle with 4 planetary final drive system with bolt on type rim.
BACKGROUND OF THE INVENTION
[002] The planetary and epicyclic gears have three bodies that referred as centralmembers which comprises of a carrier, ring gear, and sun gear. The planetgears are connected by bearings to the carrier and are simultaneously in mesh withthe sun gear and ring gear. The number of planet gears varies depending on thedesign load of the system. Having multiple planets gives planetary gears multipleload paths and compact packaging. All central members kinematically rotate aboutthe same axis, although one central member is typically stationary. The planetarygears rotate about axes that are fixed to the carrier, which might also rotate. Dynamic tooth and bearing loads affect the lifetimes of planetary gear components. The advantages of planetary gears are only realized if the individual planets carrynearly equal load.
[003] In an embodiment of the conventional design, the dump truck rear axle comprises of No SPIN differential and final drive system with wedge type wheel mounting which has a major drawback that failures of planet gears in final drive is due to high bending and contact stress where load on planetary gearbox causes tension in gears and this causes wear and tear of gear.
[004] The Axle shaft is an important element of the planetary gear system which transmitstorque from NoSPIN differential to the planetary gear set wherein NoSPIN maximizestraction by delivering 100% of the torque and power to both drive wheels. It isengineered to keep both wheels in a constant drive mode, yet has the ability toautomatically “unlock” during vehicle turning to permit necessary wheel speeddifferentiation. For example, the faster turning wheel overruns, momentarily, untilboth wheel speeds are synchronized. When wheel speeds match, the NoSPINautomatically re-engage to fully locked operation. During slurry condition, torquegets transmitted to one side of Final drive. Further, the sun gear is subjected toimpact loads which lead to crack initiation in the root of the gear. Repetitiveapplication of these loads, generally bending loads, will cause rapid fatigue failure ofthe 3-planetray gear set. The drawback on existing 3-Planetary system is hightorque which is induced on Sun gear, Planet Gear and Ring Gear resulting in highBending & Contact stress, which leads to frequent failures of sun & planet gears.
[005] In another embodiment of the conventional design, the rear axle having wedge typerim which increases the manufacturing lead time consumed for assembly is more.
[006] Hence there is a need of modular construction of full floating axle with 4 planetarysystems which reduces the manufacturing lead time for assembly and for betterbending & contact stress.

OBJECTIVE
[007] A main objective of the present invention is to provide a Modular Rear Axle with compact Final drive system with plurality of planetary gears.
[008] Yet another objective of the present invention is to provide for a Modular Axle with compact Final drive system that allows reduction in bending and contact stress.
[009] Yet another objective of the present invention is to provide for a final drive system that reduces manufacturing lead time for assembly due

SUMMARY OF THE INVENTION:
[0010] The present invention relates to a modular axle with a final drive system having four planetary gears. A modular axle with a planetary final drive system with bolt on type rim, the modular real axle comprises of a differential assembly facilitating output to spin at a different speed. The differential assembly is provided with a bevel pinion fastened with coupling and a bevel gear an axle housing mounted with the differential assembly at its one end. Further, the axle comprises of a brake assemblywhich is having one end coupled with the differential assembly The axle also comprises of a final drive systemprovided for power transmission and having one end coupled with the axle housing. Further, the final drive systemcomprises asun gear provided at the core of the final drive system to receive the power from drive shaft and to cause revolution of the plurality planetary gear; a plurality of planetary gear provided for transmission of input power; a planet shaft holding the plurality of planetary gears; wherein the final drive system is bolt on type rim
[0011] In an aspect, the modular axle with a planetary final drive system with bolt on type rimthe differential assemblyis No-Spin Differential.
[0012] In an aspect, the modular axle with a planetary final drive system with bolt on type rimthe final drive system
[0013] In an aspect, the plurality of planetary gears in the final drive system is four in numbers

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[0014] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. 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 figures to reference like features and components. Some embodiments of system or methods in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0015] Fig. 1 schematically illustrates a side and front view of 4 planetary final drive with modular construction (bolt on type).
[0016] Fig. 2 illustrates a cross sectional view of a modular rear axle.
[0017] Fig. 3 illustrates an exploded view of 4 planetary final drive system.
[0018] Fig. 4 shows a cross sectional view of four planetary final drive system.
[0019] Fig. 5 is a flow chart illustrating power train of a vehicle with the embodied final drive system.
DETAILED DESCRIPTION OF THE CURRENT INVESTIGATION
[0020] These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.
[0021] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments and detailed in the following description. Descriptions of well-known components and processing techniques are omitted to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0022] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject matter and are included within its spirit and scope. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.
[0023] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope.
[0024] A final drive is that part of a power transmission system between the drive shaft and the differential. Its function is to change the direction of the power transmitted by the drive shaft through 90 degrees to the driving axles. At the same time, it provides a fixed reduction between the speed of the drive shaft and the axle driving the wheels.The reduction of gear ratio of the final drive is determined by dividing the number of teeth on the ring gear by the number of teeth on the pinion gear.
[0025] In an embodiment of the present invention according to fig. 1 that shows a modular dumper axle assembly 100. The Modular RearAxle Design for Dump Truck is of Fully Floating type with 4- Planetary final drivesystem 101 with effective oil cooled Wet Multiple Disc Brakes for Service Brake & Parkingbrake application is disclosed. The dumper axel assembly 100 further comprises of a final drive 101, an axle housing assembly 102, a differential assembly 103 and an in-board parking brake assembly 104 and final drive 101. The differential assembly 103 splits the engine torque two ways, allowing each output to spin at a different speed. The Brake assembly 104 is mounted to Axle beam structure on both Left Hand& Right Hand sides. A wet disc brake consists of rotating friction discs, which are positioned between stationary steel plates. The wet disc brake functions in a liquid coolant bath entirely sealed-off from the vehicle operating environment and produces torques, as the stationary plates are forced closer to the rotating discs as shown in Fig: 7. The benefits of increased lining life over the drum or disc brake result from the exclusion of dirt contamination as well as the fact that torque is developed through viscous shear rather than actual friction lining contact with a rotating member.
[0026] In reference to Fig. 2 that illustrates cross-sectional view of dumper axle assembly 100.The differential assembly 103 comprises of a bevel pinion 208 and is fastened with a coupling and a bevel gear 203 is assembled with NoSPIN differential and differential casing. During the assembly, the coupling is fastened to a propeller shaft which is not shown in the Fig. 2 but shown in Fig. 6.
[0027] In reference to Fig. 3, showing exploded view of the rear axle, the axle housing assembly (100) comprises of a centre housing (306) and two housing extensions. The differential assembly (308) is mounted on Centre Housing (306) and the LH & RH Brake assemblies are mounted on respective Housing extensions. The Axle shaft splines meshes with Side Gear of No-Spin differential (204) and Sun Gear (404) of Final Drive System.
[0028] As per an embodiment of the present disclosure, fig. 4 illustrates cross sectional view of the final drive system 101. The final drive system comprises of a sun gear 404 mounted at the core of the final drive system 101, a plurality of planetary gears 403 is provided that revolves around the sun gear. Further, the final drive system 101 comprises of a plurality planet shaft 401 for each of the plurality of planet gears 403 for providing support to the planetary gears 403.the sun gear 404 is the input member and Carrier 408 is the output member. As per an embodiment, the plurality of planetary gears 403 are four in number. The 4 planetary gears mesh with the ring gear, which is stationary, causing the planetary gears to revolve around the sun gear. A carrier is provided (not shown in fig. 4) which holds the planetary gears together and sets their spacing. It rotates with the
planetary gears i.e., reduction in speed and increased Torque and incorporates the
output to carrier coupled with Wheel Hub assembly. In a planetary final drive system 101, teeth are engaged at once, which allows high speed reduction to beachieved with relatively small gears. Having multiple teeth share the load also allows The Modular Design suitswith existing Differential bevel ratio. The gear parameters such as Gear Module, Pressure angle, No. of teeth is designed for reduced drive ratio, Face width for reduction in bending stress & Contact stress.
[0029] A power train is shown in Fig. 5. The power train refers to the group of components that act to deliver power to the driving wheels of a vehicle. The power to run a vehicle starts in the crankshaft. It is then delivered to the clutch, via the flywheel to a torque-converter (in an automatic). Power then goes to the transmission, where it is redirected to the propeller shaft. The drive shaft directs the power to the drive axle, which contains both a final drive 101, and a differential. The final drive 101 connects the drive shaft to the differential, which then directs power to each wheel
,CLAIMS:We claim:
1. A modular axle with a planetary final drive system with bolt on type rim, the modular real axle (100) comprising:
a differential assembly (103) facilitating output to spin at a different speed and is provided with a bevel pinion (208) fastened with coupling and a bevel gear (203)
an axle housing (102) mounted with the differential assembly (103) at its centre;
a brake assembly (104) having one end coupled with axle housing (102), and
a final drive system (101) provided for power transmission and having one end coupled with the axle housing (102);
wherein, the final drive system (101) further comprises
a sun gear (404) provided at the core of the final drive system (101) to receive the power from drive shaft and to cause revolution of the plurality planetary gear (403);
a plurality of planetary gear (403) provided for transmission of input power;
a planet shaft (401) holding the plurality of planetary gears (403);
wherein the modular axle bolt on type rim
2. The modular axle (100) with a planetary final drive system (101) with bolt on type rim as claimed in claim 1, wherein the differential assembly (103) is No-Spin Differential.
3. The modular axle (100) with a planetary final drive system (101) with bolt on type rim as claimed in claim 1, wherein the plurality of planetary gears 403 in the final drive system (101) is four in numbers