FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See Section 10 and Rule13]
Title: “AN ISOLATOR GEAR, A COMPOSITION OF VIBRATION ISOLATOR USED IN ISOLATOR GEAR AND METHODS THEREOF”
Name and Address of the Applicant:
TATA MOTORS LIMITED, Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai – 400 001, Maharashtra, India
Nationality: Indian
The following specification particularly describes the invention and the manner in which it is to be performed.

TECHNICAL FIELD
The present disclosure relates to gear systems, more particularly relates to gear designs comprising a vibration isolator in the gears for reducing vibrations and noise propagation during its operation. The present disclosure also relates to a composition of the vibration isolator used in the isolator gear and a method of preparing the composition.
BACKGROUND AND PRIOR ARTS OF THE DISCLOSURE
In recent years, vibrations and noises emanating from various gear system have come to pose a problem. One of the causes for the problem resides in the fact that when motors with the gears are in operation, the vibrations from these gears are transmitted to frames of automobile. It is observed that design of the gear plays a major role in causing the vibration and noise in the gear system. The practice of interposing a vibration isolator within the gear has been heretofore resorted for precluding transmission of vibration and abating noise. The composition of this vibration isolator becomes an important factor in reducing the noise and the vibration.
Various gear systems are known which utilize thermoplastic and nitrile rubbers to manufacture a vibration isolator. For example, gear system comprising Thermoset Elastomer [Nitrile butadiene rubber (NBR), Silicone, Hydrogenated Nitrile Butadiene Rubber (HNBR), Nitrile Rubber (NR) & CR] & Thermoplastic Elastomer are provided in the U.S Patent No. 6,482,119. Further, U.S. Patent No. 1,649,426 provides information on use of isolator rubber in the gear to address the issue of noise and vibration. However, the existing arts have limitations with respect to the reduction in the noise and vibration and also the durability and dampening capacity. Therefore, there exists a need to provide an elastomeric composition in the isolator gear systems which obviates the limitations of the prior arts.
The present disclosure aims at producing such an isolator gear having unique designs such that the noise and the vibration within the gear system are drastically reduced with the help of thermoset elastomeric composition in the isolator gear.
STATEMENT OF THE DISCLOSURE
Accordingly, the present disclosure relates to an isolator gear comprising a gear ring configured with predetermined number of gear ring lugs at inner periphery of the gear ring; a gear hub provided inside the gear ring, wherein the gear hub is configured with

predetermined number of gear hub lugs at outer periphery of the gear hub; and a vibration isolator molded in a space formed between the gear ring and the gear hub, also provides for a method of manufacturing an isolator gear, wherein the method comprising acts of pre-heating the gear hub and the gear ring; placing the preheated gear hub and the gear ring in a mold, such that a space is formed in between the gear hub and the gear ring; providing vibration isolator under predetermined pressure into the space between the gear hub and the gear ring; curing the isolator gear; and post curing the isolator gear to a predetermined temperature, also provides for a composition of a vibration isolator used to manufacture the isolator gear, the composition comprises 72% weight of fluro elastomer, 18% weight of carbon black, 3% weight of plasticizer, 0.5% of bonding promoter, 0.65% of curative agent 0.15% of activator. and wax, also provides for a method of preparing a composition as claimed in claim 8, the method comprising acts of Premasticating pre-compounded fluroelastomer for a predetermined time; mixing predetermined % weight of a carbon black along with predetermined % weight of plasticizer with the premasticated fluroelastomer to obtain first intermediate composition; and mixing predetermined % weight of the carbon black along with bonding promoter and activator to the first intermediate composition for a predetermined time to obtain a second intermediate composition; and providing the second intermediate composition in between two rolls of a rolling machine for a predetermined passes to obtain the composition.
OBJECTS OF THE DISCLOSURE
One object of the disclosure is to provide an isolator gear design with a vibration isolator such as a thermoset elastomer for reducing noise and vibrations in the engine.
Another object of the disclosure is to provide a method of manufacturing the isolator gear comprising the vibration isolator.
Another object of the disclosure is to provide a composition of a thermoset elastomer having higher noise absorption properties.
Another object of the disclosure is to provide a method of preparing the composition of the thermoset elastomer having higher noise absorption properties.

SUMMARY
The shortcomings of the prior art are overcome and additional advantages are provided through the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
In one embodiment, the disclosure is related to an isolator gear. The isolator gear comprises a gear ring configured with predetermined number of gear ring lugs at inner periphery of the gear ring. A gear hub is provided inside the gear ring, wherein the gear hub is configured with predetermined number of gear hub lugs at outer periphery of the gear hub. A vibration isolator is molded in a space formed between the gear ring and the gear hub after assembling the gear hub with the gear ring. The gear ring is provided with at least one gear ring profile in between two gear ring hubs.
In one embodiment, the gear ring profile is in a predetermined shape selected from a group comprising rectangular, circular and parabolic. The gear hub lugs accommodates into the gear ring profile.
In one embodiment, the vibration isolator is a thermoset elastomer comprising 72% weight of fluro elastomer, 18% weight of carbon black, 3% weight of plasticizer, 0.5% of bonding promoter, 0.65% of curative agent, about 6% to about 8% of activator and wax.
In one embodiment, the present disclosure is related to a method of manufacturing an isolator gear. The method comprising acts of pre-heating the gear hub and the gear ring; placing the preheated gear hub and the gear ring in a mold, such that a space is formed in between the gear hub and the gear ring; providing vibration isolator under predetermined pressure into the space between the gear hub and the gear ring; curing the isolator gear; and post curing the isolator gear to a predetermined temperature.
In one embodiment, curing step involves main curing stage and step curing stage, which is carried out post the main curing stage.
In one embodiment, the main curing is carried out a temperature of about 180ºC to about 200ºC for about 12 to about 13 minutes.

In one embodiment, step curing is a post curing step, wherein the isolator gear is heated at various temperatures such as firstly at 130°C to 150ºC for 2 to 3 hours, secondly at 155°C to 175°C for 2 to 3 hours and thirdly 180°C to 200°C for 10 to 12 hours.
In one embodiment of the present disclosure is related to a composition of a vibration isolator used to manufacture the isolator gear. The composition comprises 72% weight of fluro elastomer, 18% weight of carbon black, 3% weight of plasticizer, 0.5% of bonding promoter, 0.65% of curative agent 6% to about 8% of activator and wax.
In one embodiment, the fluro elastomer comprises VITON E-60 C or VITON A-361 C or a combination thereof and comprises di-polymeric ionic group with 66% fluorine.
In one embodiment, fluro elastomer comprises di-polymer base with VF2(Vinylidene fluoride) and HFP (Hexafluoroproplyne) or a combination thereof with a mooney viscosity of 60 and 30, respectively.
In one embodiment, the carbon black is selected from a group comprising medium thermal black and semi-reinforcing furnace carbon black or a combination thereof.
In one embodiment, the plasticizer is selected from a group comprising Di-Butoxy trigylcol Adipate, Bis(2-(2-butoxy ethoxy ethyl) Adipate and polyether ester type plasticizer or a combination thereof.
In one embodiment, the bonding promoter comprises T-Butyl Ammonium Bromide.
In one embodiment, the activator is selected from a group comprising magnesium oxide and calcium hydroxide or a combination thereof.
In one embodiment, the curative agent is selected from a group comprising dihydroxy aromatic compound and accelerator phosphanium salt and its combination thereof.
In one embodiment, the dihydroxy aromatic compound is 30% active, wherein dihydroxy aromatic compound is 30% and remaining 70 % is fluro elastomer compound.
In one embodiment, the phosphanium salt is 20% Active, wherein phosphanium salt is 30% and remaining 70 % is fluro elastomer compound.

In one embodiment, a method of preparing a composition is provided. The method comprising acts of Pre-masticating pre-compounded fluroelastomer for a predetermined time; mixing predetermined % weight of a carbon black along with predetermined % weight of plasticizer with the premasticated fluroelastomer to obtain first intermediate composition; and mixing predetermined % weight of the carbon black along with bonding promoter and activator to the first intermediate composition for a predetermined time to obtain a second intermediate composition; and providing the second intermediate composition in between two rolls of a rolling machine for a predetermined passes to obtain the composition.
In one embodiment, the pre-compounded fluroelastomer is premasticated for 3 minutes.
In one embodiment, 50 % weight of the carbon black along with 50% of plasticizer is mixed to the premasticated fluroelastomer to obtain the first intermediate composition.
In one embodiment, 50% weight of the carbon black along with 100% weight of bonding promoter and 100% weight of activator are mixed to the first intermediate composition to obtain the second intermediate composition.
In one embodiment, the second intermediate composition is passed in between two rolls of the rolling machine for 3 times.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
In order that the disclosure may be readily understood and put into practical effect, reference will now be made to exemplary embodiments as illustrated with reference to the accompanying figures. The figures together with a detailed description below, are incorporated in and form part of the specification, and serve to further illustrate the embodiments and explain various principles and advantages, in accordance with the present disclosure where:
Figures 1 to 9 shows various configurations of gear ring and gear hub of an isolator gear according to the present disclosure.
Figure 10 shows front view of the isolator gear comprising a vibration isolator according to the present disclosure.

Figures 11a and 11b shows sectional views of the Figure 9 taken through axis A-A and axis B-B respectively, according to the present disclosure.
Figures 12-15 shows comparative graphs of noise reduction in a balancer shaft gear of an engine according to the present disclosure.
The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description 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 OF EXEMPLARY EMBODIMENTS OF THE DISCLOSURE
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the 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 disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure, 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. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the disclosure.
It is to be noted at this point that all of the components, whether alone or in any combination, are claimed as being essential to the invention, in particular the details depicted in the drawings and reference numerals in the drawings are as given below.

Table of referral numerals

Referral numeral Description
1 Isolator gear
2 Gear ring of the isolator gear
2a Gear ring lug
2b Gear ring profile
3 Vibration isolator
4 Gear hub of the isolator gear
4a Gear hub lug
4b Gear hub profile
Definitions:
Pre-compounding: Raw rubber itself is compounded with dihydroxy aromatic compound and
phosphanium salt for better dispersion before the main mixing is carried out.
Pre-mastication: Pre-mastication is a method by which material viscosity is brought down for better mixing.
Push-out strength: The strength at which gear hub separates from gear ring or from thermoset elastomer while applying force in vertical direction.
Carbon Black: Is a compounding ingredient used for reinforcement to get desired stiffness.
Plasticizer: Is a compounding ingredient used to enhance the deformability of polymeric compound.
Bonding promoter: Is a compounding ingredient used to enhance bonding between rubber compound and metal.
Curative: Is a compounding ingredient which makes internal cross linking.
Activator: Is a compounding ingredient that increases the effect of accelerators.
Wax: Is a compounding ingredient used as process aid.

Figures 1-9 illustrates various design configurations of the gear ring (2) and the gear hub (4) of the isolator gear (1) which helps in reducing the vibration and noise in the isolator gear (1). The isolator gear (1) comprising the gear ring (2) and the gear hub (4). The gear ring (2) comprises four gear ring lugs (2a). The gear hub (4) comprises four gear hub lugs (4a) with respect to notch of the isolator gear (1). The gear ring (2) is provided with at least one gear ring profile (2b) in between two gear ring lugs (2a). The gear ring profile (2b) is in a predetermined shape selected from a group comprising rectangular, circular and parabolic. The gear hub lugs (4a) are designed in such a way that the gear hub lugs (4a) accommodate the gear ring profile (2b). The gear hub (4) is also provided with at least one gear hub profile (4b) between two gear hub lugs (4a). The gear hub profile (4b) can be of shape selected from a group but not limited to circular, oval, rectangular, square, and parabolic.
For an example, a uniform gap ranging from 1 mm to 1.5 mm is maintained between outer surface of the gear hub lug (4a) and outer surface of the gear ring lug (2a). Also, a uniform gap ranging from about 3.5 mm to about 4.5 mm is maintained between an outer surface of the gear hub (4) and an inner surface of gear ring (2). These dimensions are designed to increase damping strength, push-out strength to address gear mesh and for rattling noise.
A vibration isolator (3) is molded into a space between the gear ring (2) and the gear hub (4). The vibration isolator (3) is a thermoset elastomer forms a metal joint between the gear ring (2) and the gear hub (4) by chemical bonding during molding process. The molding process for manufacturing the isolator gear (1) with a thermoset elastomer is selected from a group comprising but not limited to transfer molding or injection molding. The molding method in the present disclosure is preferably the transfer molding method.
The isolator gear (1) is used in a balancer shaft (not shown) of an engine (not shown). The isolator gear (1) is provided with a gear ring (2) and a gear hub (4). The thermoset elastomer composition is provided in a space formed between the gear ring (2) and the gear hub (4) for dampening vibrations in the balancer shaft and thus to reduce the noise emanating from the engine of an automobile.
The transfer molding method of manufacturing the isolator gear (1) involves preheating gear ring (2) and the gear hub (4) of the isolator gear (1) to a temperature of about 80ºC to about 100ºC for 3 to 5 minutes, then placing the preheated gear ring (2) and the gear hub (4) in a

mold. The gear ring (2) and the gear hub (4) are placed in the mold such that both the gear ring (2) and the gear hub (4) are aligned concentrically. A locator is provided in the mold to maintain concentricity between the gear ring (2) and the gear hub (2). After setting of mold with the isolator gear (1), a predetermined quantity of the thermoset elastomer is passed under pressure of about 180kg/cm2 to 200 Kg/cm2 into the space or gap between the gear ring (2) and the gear hub (4). The thermoset elastomer compound is subjected to a temperature of about 180ºC to about 200ºC when passing into the space or gap of the isolator gear (1) during mold clamping by applying pressure. Once, the space or gap in the isolator gear (1) is filled with desired quantity of the thermoset elastomer compound (3) then the curing starts. The isolator gear (1) is removed from the mold assembly (not shown) after 12 to 13 minutes for post curing. The thermoset elastomer compound in the isolator gear (1) is having a thickness of about 8 mm to about 13 mm. The post curing process on the isolator gear (1) comprising the thermoset elastomer (3) is carried out to obtain proper setting of the thermoset elastomer compound in the isolator gear (1). The post curing process in the present invention is preferably but not limited to step curing process. The step curing process comprises heating of the isolator gear (1) having the thermoset elastomer in a hot environment such as but not limited to an oven or a furnace. The step curing is carried out at various temperatures such as firstly at 130°C to150°C for 2 to 3 hours, secondly at 155°C to 175°C for 2 to 3 hours and thirdly at 180°C to 200°C for 10 to 12 hours. Thus after the curing process, the isolator gear (1) is properly set with the thermoset elastomer compound and can be used in the balancer shaft of the automobiles.
In an embodiment the disclosure relates to a composition of a thermoset elastomer. The thermoset elastomer comprises fluroelastomer pre-compounded with curative and accelerator, carbon black, plasticizer, bonding promoter, and activator. The thermoset elastomer can optionally be added with wax. The fluroelastomer in the thermoset elastomer is in the range of 71% to 73% by weight. The carbon black is in the range from about 16.5 % to about 19.5% by weight. The carbon black used is selected from a group comprising but not limited to medium thermal black and semi-reinforcing furnace carbon black and its combination thereof. The plasticizer is in the range of 2% to about 2.5% by weight. The plasticizer is selected from a group comprising but not limited to at least one of Di-Butoxy trigylcol Adipate, TP-759 ( Bis(2-(2 butoxy ethoxy ethyl adipate) and RS-735 (Mixed ether & ester type) and its combination thereof. The plasticizer is added in order to enhance the

deformability of elastomer compound & to improve the damping effect. The bonding promoter is in the range from about 0.3% to 0.5% by weight. The bonding promoter is selected from a group comprising but not limited to t-butyl ammonium bromide or any combination thereof. The bonding promoter is added to improve bonding strength between rubber compound and metal. The curative agent is in the range from about 0.6 to 0.7% by weight. The curative agent is selected from a group comprising but not limited to di-hydroxy aromatic compound and phosphanium salt and its combination thereof. The activator is in the range from about 6% to about 8% by weight. The activator used in the above composition is selected from a group comprising magnesium oxide and calcium hydroxide and its combination thereof. The wax used in the composition can be carnauba wax. The thermoset elastomer is thermal stable which can withstand a temperature ranging from about (-20°C to about 230ºC. The fluroelastomer used to prepare the composition is VITON E-60 C and VITON A-361 C but not limited to VITON. The fluroelastomer VITON E-60 C and VITON A-361 C comprises polymeric ionic group with 60% to 70% fluorine and having a mooney viscosity of about 60 and about 30, respectively.
In another embodiment, adhesive material is applied on inner hub & outer ring to increase bonding strength between elastomer compound and contacting gear ring (2) / gear hub (4) of the isolator gear (1). The adhesive material is applied on gear hub & ring before molding process of the isolator gear. For example, when the adhesive material is applied on inner hub & outer ring comprising a phosphated layer, then the adhesive strength of the isolator gear is about 540 kg. In another example, when the adhesive material is not applied on gear hub & ring comprising only a phosphated curative agent, then the adhesive strength of Isolator gear is about 175 kg.
In another embodiment of the disclosure, it provides for a method of preparing a composition to obtain the thermoset elastomer. The method comprises acts of pre-compounded fluroelastomer with curative agent is having mooney 60 and 30 is pre-masticating for about 3 minutes to about 4 minutes, mixing about 50% weight of a carbon black along with 100 % of plasticizer with the pre-masticated fluroelastomer to obtain the first intermediate composition and mixing remaining 50% weight of the carbon black along with bonding promoter of about 100% by weight and activator of about 100% by weight to the first intermediate composition and mixing the second intermediate for about 3 minutes to about 4 minutes to obtain a second intermediate composition; and, providing the second intermediate composition in between

two rolls of a rolling machine (not shown), having a gap of about 2 mm for about 3 to about 5 times to obtain the composition.
The adhesive agents are selected from a group comprising megum 3290, chemlok 5151 (silane based adhesive) is applied on gear hub and gear ring on specified area.
Figure 10a illustrates cross section of the isolator gear (1) taken through A-A showing the occupancy of composition of vibration isolator (3) between the gear ring (2) and the gear hub (4) in the isolator gear (1).
Figure 10b illustrates cross section of the isolator gear (1) taken through B-B showing the occupancy of the composition of vibration isolator (3) between the gear ring (2) and the gear hub (4) in the isolator gear (1).
Figures 12-15 illustrates comparative graphs of noise reduction in tooth meshing in a balancer shaft gear, of frequency range 600 to 800 Hz and in broad band rattling frequency range of 1000 to 2000 Hz. It is evident that there is a significant reduction is observed in balancer shaft gear comprising thermoset elastomer. Noise, vibration and harshness test are performed on the finished product comprising thermoset elastomer i.e. the isolator gear and below are the results of the test performed.

Test Test Specification Pump Casin Vibration g Engine Noise (dBA) Average
No.
X Y Z LH side Rear side
72
68 69 RH side
74
70 72 Front side
72
68 68 Top side
74
71 70

1 Baseline 2.1 2.3 2.0 72



73
2 Isolated Balancer gear 0.9 1.0 1.1 68



69
3 Isolated Balancer and crankshaft gear 1.6 1.0 1.5 67



69
Based on the noise, vibration and harshness test, it is observed that there is 4DB reduction in noise on engine level test and 2 DB noise reductions on vehicle level test upon using the isolator gear comprising thermoset elastomer compound.

Advantages
In an embodiment, the isolator gear helps in significant reduction of vibration and noise in
engine as well as in the vehicle.
In an embodiment, engine durability meets upon using isolator gear comprising the thermoset elastomer.
In an embodiment, the isolator gear can withstand high temperature environment.
In another embodiment of the present disclosure, fluro-elastomer is used considering high temperature application and excellent resistance to oils, fuels and dust.
Equivalents
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of

an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

We claim:
1. An isolator gear (1) comprising:
a gear ring (2) configured with predetermined number of gear ring lugs (2a) at inner periphery of the gear ring (2);
a gear hub (4) provided inside the gear ring (2), wherein the gear hub (4) is configured with predetermined number of gear hub lugs (4a) at outer periphery of the gear hub (4); and
a vibration isolator (3) molded in a space formed between the gear ring (2) and the gear hub (4).
2. The isolator gear (1) as claimed in claim 1, wherein the gear ring (2) is provided with at least one gear ring profile (2b) in between two gear ring hubs (2a).
3. The isolator gear (1) as claimed in claim 2, wherein the gear ring profile (2b) is in a predetermined shape selected from a group comprising rectangular, circular and parabolic.
4. The isolator gear (1) as claimed in claims 1 and 2, wherein the gear hub lugs (4a) accommodates into the gear ring profile (2b).
5. The isolator gear (1) as claimed in claim 1, wherein the gear hub (4) is provided with at least one gear hub profile (4b) between two gear hub lugs (4a).
6. The isolator gear (1) as claimed in claim 5, wherein the gear hub profile (4b) is in a shape selected from a group comprising circular, oval, rectangular, square, and parabolic.
7. The isolator gear (1) as claimed in claim 1, wherein the vibration isolator (3) is a thermoset elastomer comprising 72% weight of fluro elastomer, 18% weight of carbon black, 3% weight of plasticizer, 0.5% of bonding promoter, 0.65% of curative agent about 6% to about 8%of activator and wax.
8. A method of manufacturing an isolator gear (1) as claimed in claim 1, wherein the method comprising acts of:
pre-heating the gear hub (4) and the gear ring (2);

placing the preheated gear hub (4) and the gear ring (2) in a mold, such that a space is formed in between the gear hub (4) and the gear ring (2);
providing vibration isolator (3) under predetermined pressure into the space between the gear hub (4) and the gear ring (2); curing the isolator gear (1); and post curing the isolator gear (1) to a predetermined temperature.
9. The method as claimed in claim 8, wherein main curing is carried at a temperature of about 180ºC to about 200ºC for about 12 to about 13 minutes.
10. The method as claimed in claim 8, wherein the post curing involves step curing stage, wherein the isolator gear is heated to various temperatures such as firstly at 130°C to 150ºC for 2 to 3 hours, secondly at 155°C to 175°C for 2 to 3 hours and thirdly 180°C to 200°C for 10 to 12 hours.
11. A composition of a vibration isolator (3) used to manufacture the isolator gear (1) as claimed in claim 1, the composition comprises 72% weight of fluro elastomer, 18% weight of carbon black, 3% weight of plasticizer, 0.5% of bonding promoter, 0.65% of curative agent, about 6% to about 8% of activator and wax.
12. The composition as claimed in claim 10, wherein the fluro elastomer comprises di-polymer base with VF2(Vinylidene fluoride) and HFP (Hexafluoroproplyne) or a combination thereof.
13. The composition as claimed in claim 10, wherein the fluro elastomer comprises di-polymeric ionic group with 66% fluorine.
14. The composition as claimed in claim 10, wherein the carbon black is selected from a group comprising medium thermal black and semi-reinforcing furnace carbon black or a combination thereof.
15. The composition as claimed in claim 10, wherein the plasticizer is selected from a group comprising Di-Butoxy trigylcol Adipate, Bis(2-(2-butoxy ethoxy ethyl) Adipate and polyether ester type plasticizer or a combination thereof.

16. The composition as claimed in claim 10, wherein the bonding promoter comprises T-Butyl Ammonium Bromide.
17. The composition as claimed in claim 10, wherein the activator is selected from a group comprising magnesium oxide and calcium hydroxide or a combination thereof.
18. The composition as claimed in claim 10, wherein the curative agent is selected from a group comprising dihydroxy aromatic compound and accelerator phosphanium salt and its combination thereof.
19. A method of preparing a composition as claimed in claim 10, the method comprising acts of:
Premasticating pre-compounded fluroelastomer for a predetermined time;
mixing predetermined % weight of a carbon black along with predetermined %
weight of plasticizer with the premasticated fluroelastomer to obtain first intermediate
composition; and
mixing predetermined % weight of the carbon black along with bonding promoter and
activator to the first intermediate composition for a predetermined time to obtain a
second intermediate composition; and
providing the second intermediate composition in between two rolls of a rolling
machine for a predetermined passes to obtain the composition.
20. The method as claimed in claim 18, wherein the pre-compounded fluroelastomer is premasticated for 3 minutes.
21. The method as claimed in claim 18, wherein 50 % weight of the carbon black along with 50% of plasticizer are mixed to the premasticated fluroelastomer to obtain the first intermediate composition.
22. The method as claimed in claims 18 and 20, wherein 50% weight of the carbon black along with 100% weight of bonding promoter and 100% weight of activator are mixed to the first intermediate composition to obtain the second intermediate composition.

23. The method as claimed in claim 18, wherein the second intermediate composition is passed in between two rolls of the rolling machine for 3 times.
24. An isolator gear, a method of manufacturing the isolator gear, a composition of a vibration isolator and a method of manufacturing the composition of the vibration isolator are substantially as herein above described and as illustrated in accompanying drawings.