DESC:FORM 2
The Patent Act 1970
(39 of 1970)
&
The Patent Rules, 2005

COMPLETE SPECIFICATION
(SEE SECTION 10 AND RULE 13)

TITLE OF THE INVENTION

“NOISE DAMPENED ROTARY TILLER”

APPLICANTS:
Name Nationality Address
Mahindra &Mahindra Limited
India
Automotive & Farm Equipment Sector, Mahindra Towers, Dr. G.M. Bhosale Marg, Worli, Mumbai – 400 018

The following specification particularly describes and ascertains the nature of this invention and the manner in which it is to be performed:-

TECHNICAL FIELD
[001] The embodiments herein generally relate to agricultural implements and more particularly, but not exclusively to rotary tillers.

BACKGROUND
[002] A rotary tiller is primarily a farming implement used for tilling land either before or after planting of crops. Rotary tillers are usually mounted on vehicles such as tractors or other similar vehicles and are operated on fields that need tilling. The primary function of rotary tiller is to stir and pulverize soil.
[003] Rotary tillers help in controlled disturbance of soil wherein the top layer of the soil is disturbed just enough to remove weed that may be present, while ensuring that the intended crop is left undisturbed. Rotary tillers are either propelled by an engine or drawn as an attachment behind a 2-wheeled or a 4-wheeled tractor.
[004] Usually rotary tillers are trailed after the tractor via a drawbar mounted on a three-point hitch or mounted on a frame beneath the tractor. Active rotary tiller implements are driven by a power take-off shaft of the tractor. While most rotary tillers are considered a secondary tillage implement, active rotary tillers are commonly used for primary tillage in lighter soils.
[005] Rotary tiller is usually equipped with a gearbox/power transmission unit for transmitting power from the power take off or an engine to a drive shaft of the rotary tiller during operation. The gearbox enables forward speed to be adjusted while the rotational speed of tines or blades mounted the drive shaft remains constant enabling an operator to regulate the extent to which soil is engaged. The noise generated in the gearbox during the operation of the rotary tiller due to rotation of gears and other moving parts in the gearbox is undesirable and results in discomfort and fatigue of the operator.
[006] Therefore, there exists a need for a noise dampened rotary tiller.

OBJECTS
[007] The principal object of an embodiment of this invention is to provide a noise dampened rotary tiller.
[008] The objects 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.

BRIEF DESCRIPTION OF DRAWINGS
[009] The embodiments of the invention are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[0010] FIG. 1 depicts a perspective view of a rotary tiller, according to an embodiment of an invention as disclosed herein; and
[0011] FIG. 2 depicts a perspective view of a power transmission unit of the rotary tiller, according to an embodiment of an invention as disclosed herein.

DETAILED DESCRIPTION
[0012] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as 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.
[0013] The embodiments herein achieve a noise dampened rotary tiller. Referring now to the drawings, and more particularly to FIGS. 1 through 2, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0014] FIG. 1 depicts a perspective view of a rotary tiller 100, according to an embodiment of an invention as disclosed herein. The rotary tiller 100 is used for tilling land either before or after planting of crops. Further, the rotary tiller 100 stirs and pulverizes the land soil for cultivation of crops. In an embodiment, the rotary tiller 100 includes a power transmission unit 102, a rotor shaft 104, a plurality of blades 106 and may include other standard components of a standard rotary tiller. In an embodiment, the rotary tiller 100 is powered by a power take off (PTO) of a vehicle (not shown). However, it is also within the scope of the invention to provide the rotary tiller 100 powered by an engine (not shown) without otherwise deterring the intended function of the rotary tiller 100 as can be deduced from the description.
[0015] FIG. 2 depicts a perspective view of a power transmission unit 102 of the rotary tiller100, according to an embodiment of an invention as disclosed herein. The power transmission unit 102 is used to transmit a power from the power take off (PTO) of the vehicle or the engine (not shown) to rotor shaft 104 of the rotary tiller 100. The power transmission unit 102 includes a housing 102a, a plurality of damping means 102b, a cover 102c, an input shaft 102d, at least one intermediate shaft 102e, an output shaft 102f, a plurality of gears 102g and may include other standard components of a gearbox of the standard rotary tiller.
[0016] The housing 102a is used to cover and facilitate mounting of the damping means 102b, at least a portion (not shown) of the input shaft 102d, the intermediate shaft 102e and each of the gears 102g. The housing 102a may also enclose other standard components that are enclosed in the standard gearbox of the standard rotary tiller.
[0017] Each of the damping means 102b are used to dampen a noise generated in the power transmission unit 102 during operation. However, it is also within the scope of the invention to provide any other means for damping the noise generated in power transmission unit 102 without otherwise deterring the intended function of each of the damping means 102b as can be deduced from the description. Each of the damping means 102b are connected or mounted to the cover 102c. However, it is also within the scope of the invention to mount each of the damping means 102b to the housing 102a or any other elements disposed inside the housing 102a without otherwise deterring the intended function of each of the damping means 102b as can be deduced from the description. Each of the damping means 102b are disposed inside the housing 102a. In an embodiment, each of the damping means 102b are made of nylon 6. However, it is also within the scope of the invention to provide each of the damping means 102b to be made of any other material without otherwise deterring the intended function of each of the damping means 102b as can be deduced from the description. Further, in an embodiment, the plurality of damping means 102b enables a reduction in noise generated in the power transmission unit 102 by 2 dB (decibels).
[0018] In an embodiment, the cover 102c is used to cover the housing 102a and to mount each of the damping means 102b. In one embodiment, the cover 102c includes a plurality of protrusions (not shown) for mounting corresponding damping means 102b. In other embodiment, the cover 102c includes a plurality of openings (not shown) for receiving corresponding damping means 102b.
[0019] In an embodiment, the input shaft 102d is driven by at least one of the power take off (PTO) of the vehicle and the engine (not shown). The input shaft 102d is rotatably connected to the intermediate shaft 102e. The input shaft 102d is configured for mounting corresponding gear 102g and other standard components of the standard gear box of the standard rotary tiller.
[0020] The intermediate shaft 102e is used to transmit a torque from the input shaft 102d to the output shaft 102f. The intermediate shaft 102e is rotatably connected to the input shaft 102d and the output shaft 102f. The intermediate shaft 102e is configured for mounting the corresponding gears 102g and other standard components of the standard gear box of the standard rotary tiller.
[0021] The output shaft 102f is rotatably connected to intermediate shaft 102e and the rotor shaft 104 of the rotary tiller 100. The output shaft 102f is configured for mounting the corresponding gear 102g and other standard components of the standard rotary tiller. The output shaft 102f drives the rotor shaft 104 of the rotary tiller 100 through a chain drive mechanism (not shown) or a belt drive mechanism (not shown).
[0022] The plurality of gears 102g are used to transmit the torque from the input shaft 102d to the output shaft 102f for driving the rotor shaft 104 of the rotary tiller 100. Each of the gear 102g are mounted to corresponding portion of the input shaft 102d, the intermediate shaft 102e and the output shaft 102f.
[0023] The rotor shaft 104 (as shown in fig. 1) is driven by the output shaft 102f through the chain drive mechanism (not shown) or the belt drive mechanism (not shown) to rotate or drive each of the blades 106 for stirring and pulverizing the soil. The rotor shaft 104 is configured for mounting each of the blades 106 of the rotary tiller 100 (as shown in fig. 1).
[0024] Each of the blades 106 are mounted to the rotor shaft 104. Each of the blades 106 is operably rotated by the rotor shaft 104 to stir and pulverize the soil for cultivation.
[0025] The working of the rotary tiller 100 is explained as follows. As and when the input shaft 102d of the power transmission unit 102 of the rotary tiller 100 is driven by the power take off (PTO) of the vehicle or the engine (not shown), the input shaft 102d drives the intermediate shaft 102e through corresponding gears 102g to drive the output shaft 102f through corresponding gears 102g to drive the rotor shaft 104 through the chain drive mechanism (not shown) or the belt drive mechanism (not shown) to rotate each of the blades 106 to stir and pulverize the soil for cultivation. The noise generated in the power transmission unit 102 during the operation of the rotary tiller 100 is dampened by each of the dampening means 102b. Thus, a noise dampened rotary tiller 100 is provided.
[0026] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
,CLAIMS:CLAIMS
We claim,
1. A rotary tiller comprising:
a power transmission unit comprising at least one damping means adapted to dampen a noise generated in the power transmission unit, the damping means disposed inside a housing of the power transmission unit.
2. The rotary tiller as claimed in claim 1, wherein the power transmission unit comprises a cover adapted to hold the damping means.
3. The rotary tiller as claimed in claim 1, wherein the power transmission unit comprises an input shaft adapted to be driven by at least one of a power take off (PTO) of a vehicle and an engine.
4. The rotary tiller as claimed in claim 1, wherein the power transmission unit comprises an output shaft adapted to drive a rotor shaft of the rotary tiller.
5. The rotary tiller as claimed in claim 1, wherein the power transmission unit comprises an intermediate shaft adapted to transmit a torque from the input shaft to the output shaft.

6. The rotary tiller as claimed in claim 1, wherein the power transmission unit comprises a plurality of gears adapted to transmit the torque from the input shaft to the output shaft.