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

“FLYWHEEL”

APPLICANTS:

Name Nationality Address
Mahindra & Mahindra Limited Indian Mahindra Research Valley,Mahindra World City(MWC),Plot No. 41/1, Anjur Post, Chengalpattu,
Kanchipuram District – 603204 (TN) INDIA

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 flywheels in vehicles and more particularly to flywheel having low weight and high inertia for vehicles like tractors.

BACKGROUND
[002] Generally, revolution per minute, herein after referred as RPM, drop of an engine and poor drivability is a perennial problem for tractors running in gradient or working on implements in the field. As the vehicle moves on a straight road, there is little RPM fluctuation. The engine RPM starts to drop down, as soon as there is gradient in the road while climbing and in the fields while working on implements.
[003] One type of the conventional flywheel increases the backup torque of the engine in order to come back to the initial rpm. Therefore, there is an increase in the fuel consumption to achieve the initial rpm thereby affecting the fuel economy. Another conventional flywheel increases the inertia to increase the rpm by increasing the weight thereby taking more time to stop the tractor and reducing the clutch life owing to increase in wear rate.
[004] Therefore, there exists a need for a flywheel having low weight and high inertia for a tractor to maintain the desired rpm.

OBJECTS
[005] The principal object of an embodiment of this invention is to provide a flywheel having low weight and high inertia for a vehicle.
[006] Another object of an embodiment of this invention is to provide a flywheel that increases clutch life.
[007] Yet another object of an embodiment of this invention is to provide a flywheel that increases fuel efficiency.
[008] These and other 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 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 this invention are illustrated in the accompanying drawings, through out 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 sectional view of the flywheel with tapered portion according to an embodiment as disclosed herein;
[0011] FIG. 2 depicts a front view of the flywheel according to an embodiment as disclosed herein;
[0012] FIG. 3 depicts a sectional view of the flywheel with step section according to another embodiment as disclosed herein;
[0013] FIG. 4 is a graphical representation showing the speed irregularity and engine rpm for a conventional flywheel and the present flywheel according to the embodiments as disclosed herein;
[0014] FIG. 5 is a graphical representation showing the instantaneous angular acceleration and crank angle for a conventional flywheel and the present flywheel according to the embodiments as disclosed herein; and
[0015] FIG. 6 is a graphical representation showing the instantaneous speed and crank angle for a conventional flywheel and flywheel according to the embodiments as disclosed herein.

DETAILED DESCRIPTION
[0016] 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.
[0017] The embodiments herein achieve a flywheel having low weight and high inertia. Referring now to the drawings, and more particularly to FIGS. 1 through 6, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0018] FIG. 1 depicts a sectional view of the flywheel according to an embodiment as disclosed herein. FIG. 2 depicts a front view of the flywheel according to an embodiment as disclosed herein. In an embodiment the flywheel 100 includes at least one first tapered portion 102, at least one second tapered portion 104, a ring gear 106, a centre hole 108 and a plurality of dowels 110. In an embodiment the first tapered portion 102 and the second tapered portion 104 are provided at an inner portion of the flywheel 100. The first tapered portion 102 and the second tapered portion 104 provides an extra mass at the corners away from a centre axis of the flywheel thereby developing inertia due to centrifugal force created during a rotation of the flywheel 100. The extra mass due to the first tapered portion 102 and the second tapered portion 104 produces an unbalanced mass and hence the desired inertia is achieved.
[0019] In an embodiment the ring gear 106 is fitted on the periphery of the flywheel 100. The ring gear 106 is provided to transfer torque from a starter motor (not shown) to the flywheel 100 to rotate an engine (not shown) to begin the cycle.
[0020] In an embodiment the centre hole 108 is provided to connect the flywheel 100 with a crankshaft (not shown). In an embodiment the dowels 110 are provided to align the pressure plate of the clutch (not shown) to the flywheel 100 and to give support.
[0021] The first tapered portion 102 and the second tapered portion 104 is configured to increase the strength of the ring gear 106 as the ring gear 106 is away from the main mass thereby increasing at least safety factor and preventing flywheel burst. The first tapered portion 102 and the second tapered portion 104, together, provide an increase in the thickness of the flywheel 100, thereby increasing heat dissipation capacity and heat sink capacity. The overall weight of the flywheel is reduced due to the first tapered portion 102.
[0022] FIG. 3 shows a sectional view of the flywheel according to another embodiment as disclosed herein. In an embodiment the flywheel 200 includes at least one tapered portion 202, at least one stepped portion 204, a ring gear 206, a centre hole 208 and a plurality of dowels 210. In an embodiment the tapered portion 202 and the stepped portion 204 are provided at an inner portion of the flywheel 200. The tapered portion 202 and the stepped portion 204 provides an extra mass at the corners which is away from the center axis of the flywheel 200, and thus develops more inertia due to centrifugal force and increases the strength due to the double cantilever effect.
[0023] In an embodiment the ring gear 206 is fitted on the periphery of flywheel 200. The ring gear 206 is provided to transfer torque from a starter motor (not shown) to the flywheel 200 to rotate an engine (not shown) to begin the cycle.
[0024] In an embodiment the centre hole 208 is provided to connect the flywheel 200 with a crankshaft (not shown). In an embodiment the dowels 210 are provided to align the pressure plate of the clutch (not shown) to the flywheel 200 and to give support.
[0025] The tapered portion 202 and the stepped portion 204 increases the strength of the ring gear 206 as the ring gear 206 is away from the main mass thereby increasing safety factor and preventing flywheel burst. The tapered portion 202 and the stepped portion 204, together, provide increase in the thickness of the flywheel 200 resulting in an increase in heat dissipation capacity and heat sink capacity. The tapered portion 202 reduces the overall weight of the flywheel 200.
[0026] FIG. 4 is a graphical representation showing the speed irregularity and engine rpm for a conventional flywheel and the present flywheel according to the embodiments as disclosed herein. The graphical representation shows the speed irregularities under the engine RPM. The dotted line shown in the graph is the speed irregularities of the conventional flywheel (not shown). The continuous line shown in the graph is the speed irregularities achieved by the flywheel 100, 200. The straight line shown in the graph is the desired speed irregularity. From the graph, it is clearly evident that the flywheel 100, 200 effectively improves the speed irregularity around 6%. Thus helps to drive the tractor with high back-up torque and easily improves the performance of the engine by reducing the specific fuel consumption and also improves the drivability of the vehicle.
[0027] FIG. 5 is a graphical representation showing the instantaneous angular acceleration and crank angle for a conventional flywheel and the present flywheel according to the embodiments as disclosed herein. The graphical representation shows the instantaneous angular acceleration under crank angle condition. The instantaneous angular acceleration is measured in rad/s2 and the crank angle is measured in degree. The dotted line shown in the graph is the instantaneous angular acceleration of the conventional flywheel (not shown). The continuous line shown in the graph is the instantaneous angular acceleration achieved by the flywheel 100, 200. From the graph, it is clearly evident that the flywheel 100, 200 effectively improves instantaneous angular acceleration, and thus helps in achieving better drivability.
[0028] FIG. 6 is a graphical representation showing the instantaneous speed and crank angle for a conventional flywheel and flywheel according to the embodiments as disclosed herein. The graphical representation shows the instantaneous speed under crank angle condition. The instantaneous speed is measured in rpm and the crank angle is measured in degree. The dotted line shown in the graph is the instantaneous speed of the conventional flywheel (not shown). The continuous line shown in the graph is the instantaneous speed achieved by the flywheel 100, 200. From the graph, it is clearly evident that the flywheel 100, 200 effectively improves instantaneous speed, and thus helps in achieving better drivability.
[0029] In an embodiment the total instantaneous torque and the instantaneous energy remain same for the conventional flywheel and the flywheel 100, 200. In an embodiment an optimized cross-section is achieved with more inertia and less weight.
[0030] 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 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
We claim,
1. A flywheel comprising:
at least one first tapered portion; and at least one second tapered portion, the first tapered portion and the second tapered portion are defined by an inner portion of the flywheel, wherein the first tapered portion and the second tapered portion provide an extra mass at the corners away from a centre axis of the flywheel.
2. A flywheel comprising:
at least one tapered portion; and at least one stepped portion, the tapered portion and the stepped portion are defined by an inner portion of the flywheel, wherein the tapered portion and the stepped portion provide an extra mass at the corners away from a center axis of the flywheel.
3. The flywheel as claimed in claim 1, further comprising a ring gear adapted to transfer a torque from a starter motor of an engine to the flywheel.
4. The flywheel as claimed in claim 1, further comprising a central hole adapted to connect the flywheel with a crankshaft of an engine.
5. The flywheel as claimed in claim 1, further comprising a plurality of dowels adapted to align a pressure plate of a clutch of the engine to the flywheel.
6. The flywheel as claimed in claim 2, further comprising a ring gear adapted to transfer a torque from a starter motor of an engine to the flywheel.
7. The flywheel as claimed in claim 2, further comprising a central hole adapted to connect the flywheel with a crankshaft of an engine.
8. The flywheel as claimed in claim 2, further comprising a plurality of dowels adapted to align a pressure plate of a clutch of the engine to the flywheel.

Date: 30th March, 2016 Signature:
Dr.Kalyan Chakravarthy

ABSTRACT
A flywheel includes at least one first tapered portion, at least one second tapered portion, a ring gear, a centre hole and a plurality of dowels. The first tapered portion and the second tapered portion are provided at an inner portion of the flywheel. The first tapered portion and the second tapered portion provide an extra mass at the corners away from a centre axis of the flywheel.

,CLAIMS:CLAIMS
We claim,
1. A flywheel comprising:
at least one first tapered portion; and at least one second tapered portion, the first tapered portion and the second tapered portion are defined by an inner portion of the flywheel, wherein the first tapered portion and the second tapered portion provide an extra mass at the corners away from a centre axis of the flywheel.
2. A flywheel comprising:
at least one tapered portion; and at least one stepped portion, the tapered portion and the stepped portion are defined by an inner portion of the flywheel, wherein the tapered portion and the stepped portion provide an extra mass at the corners away from a center axis of the flywheel.
3. The flywheel as claimed in claim 1, further comprising a ring gear adapted to transfer a torque from a starter motor of an engine to the flywheel.
4. The flywheel as claimed in claim 1, further comprising a central hole adapted to connect the flywheel with a crankshaft of an engine.
5. The flywheel as claimed in claim 1, further comprising a plurality of dowels adapted to align a pressure plate of a clutch of the engine to the flywheel.
6. The flywheel as claimed in claim 2, further comprising a ring gear adapted to transfer a torque from a starter motor of an engine to the flywheel.
7. The flywheel as claimed in claim 2, further comprising a central hole adapted to connect the flywheel with a crankshaft of an engine.
8. The flywheel as claimed in claim 2, further comprising a plurality of dowels adapted to align a pressure plate of a clutch of the engine to the flywheel.