FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See Section 10 and Rule 13)
AN APPARATUS AND A METHOD FOR TESTING OF A STRAIGHT BEVEL GEAR
KALYANI TECHNOFORGE LIMITED
An Indian Company having registered address at: S. No. 72-76, Behind Siporex (I) Ltd. Mundhwa, Pune 412036, Maharashtra
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

TECHNICAL FIELD
[001] The present subject matter relates generally to Gear testing, and more specifically to an apparatus and a method for testing of a straight bevel gear set using a universal testing machine.
BACKGROUND
[002] Generally, gears or gearing is one of the most critical components in a mechanical power transmission system, and in most industrial rotating machinery. Typically, gears will outweigh as the most effective means of transmitting power in machines due to their high degree of reliability and compactness. There are many types of gears such as spur gears, helical gears, bevel gears, worm gears, gear rack, etc. These can be broadly classified by looking at the positions of axis such as parallel shafts, intersecting shafts and non-intersecting shafts.
[003] Bevel Gears are gears set where the axis of the two shafts intersect and the tooth-bearing faces of the gears themselves are conically shaped. Bevel gears are most often mounted on shafts that are 90 degrees apart but can be designed to work at other angles as well. The pitch surface of bevel gears is a cone. Typically, Bevel gears are classified according to the tooth profile and orientation. The types of bevel gears are straight, spiral, Zerol, and hypoid.
[004] Mechanical tests are performed to evaluate the durability of gears under load. Gear tooth failures occur in two distinct regions, namely, the tooth flank and the root fillet. Other common failure modes are scoring, wear, and pitting, on tooth flanks. Failures in root fillets are primarily due to bending fatigue but can be precipitated by sudden overloading (impact). The most conclusive test of bevel gears is their operation under normal running conditions in their final mountings. Testing not only maintains quality and uniformity during manufacture, but also determines if the gears will be satisfactory for their intended applications.

[005] Conventional system and method for testing in particularly of bevel gear comprises of complicated machinery. Further such convention testing machine are dedicated only for bevel gear, and very costly further requiring elaborate set and maintenance. Additionally, conventional system and method for testing bevel gear fail to provide a versatile apparatus and method.
SUMMARY
[006] Embodiments of the present disclosure present technological improvements as solutions to one or more of the above-mentioned technical problems.
[007] Before the present subject matter relating to an apparatus and a method for testing of a straight bevel gear set using a universal testing machine, it is to be understood that this application is not limited to the particular system(s) and methodologies described, as there can be multiple possible embodiments which are not expressly illustrated in the present disclosure. It is also to be understood that the terminology used in the description is for the purpose of describing the implementations or versions or embodiments only and is not intended to limit the scope of the present subject matter.
[008] This summary is provided to introduce aspects related to an apparatus and a method for testing of a straight bevel gear set using a universal testing machine. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the present subject matter.
[009] In an embodiment of the present disclosure, an apparatus for testing of a straight bevel gear set using a universal testing machine is disclosed. In the embodiment, the apparatus comprises a first element coupled to a movable arm of a universal testing machine, and a second element coupled to a static arm of the universal testing machine. In one example, the first element comprises a plate holding shaft, and one of a pinion tooth plate or a side gear tooth plate mounted on the plate holding shaft via nut and bolt, Further, the pinion tooth plate and a side

gear tooth plate comprises one or more wedge tooth. In one more example, the second element comprises one of a pinion mounted on a pinion holding shaft, or a side gear mounted on a side gear holding shaft. Further, during testing one of the pinion tooth plate engages with the pinion or the side gear tooth plate engages with the side gear to transfer a compressive load from the universal testing machine to the highest point of single tooth contact in turn generating stress at root of the pinion and the side gear thereby testing the bevel gear set.
[0010] In an embodiment of the present disclosure, a method for testing of a straight bevel gear set using a universal testing machine is disclosed. In the method comprises coupling a first element to a movable arm of a universal testing machine coupling a second element to a static arm of the universal testing machine. In one example, the first element comprises a plate holding shaft and one of a pinion tooth plate or a side gear tooth plate mounted on the plate holding shaft via nut and bolt. Further, the pinion tooth plate and a side gear tooth plate comprise one or more wedge tooth. In one more example, the second element comprises one of a pinion, of a bevel gear set, mounted on a pinion holding shaft, or a side gear mounted, of a bevel gear set, on a side gear holding shaft. Further, the method comprises executing a testing on the bevel gear set. Furthermore, during testing one of the pinion tooth plate engages with the pinion or the side gear tooth plate engages with the side gear to transfer a compressive load from the universal testing machine to the highest point of single tooth contact in turn generating stress at root of the pinion and the side gear thereby testing the bevel gear set.
[0011] Additional aspects, advantages, features and objects of the present disclosure would be made apparent from the drawings and the detailed description of the illustrative embodiments. It will be appreciated that features of the present disclosure are susceptible to being combined in various combinations without departing from the scope of the present disclosure as defined by the below mentioned detailed description and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The foregoing 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 system/ apparatus or method disclosed in the document and the drawings.
[0013] The present disclosure is described in detail 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 various features of the present subject matter.
[0014] Figure 1 is a perspective view depicting one embodiment of an apparatus for testing of bevel gear set for Pinion using universal testing machine, in accordance with an exemplary embodiment of the present disclosure.
[0015] Figure 2 illustrate a sectional view of one embodiment of the apparatus for testing of bevel gear set using universal testing machine, in accordance with exemplary embodiments of the present disclosure.
[0016] Figure 3 is an exploded view of one embodiment of the apparatus for testing of bevel gear set using universal testing machine, in accordance with an exemplary embodiment of the present disclosure.
[0017] Figure 4 illustrates an isometric view of another embodiment of the apparatus for testing of bevel gear set for Side Gear using universal testing machine, in accordance with an embodiment of the present subject matter.
[0018] Figure 5 illustrates a sectional view of another embodiment of the apparatus for testing of bevel gear set using universal testing machine, in accordance with an embodiment of the present subject matter.

[0019] Figure 6 illustrates an exploded view of another embodiment of the apparatus for testing of bevel gear set using universal testing machine, in accordance with an embodiment of the present subject matter.
[0020] Figure 7 illustrates a sectional view of a plate holding shaft, in accordance with an embodiment of the present subject matter.
[0021] Figure 8 illustrates a sectional view a pinion holding shaft, in accordance with an embodiment of the present subject matter.
[0022] Figure 9 illustrates top view of a side gear holding shaft, in accordance with an embodiment of the present subject matter.
[0023] Figure 10 illustrates the sectional view the side gear holding shaft, in accordance with an embodiment of the present subject matter.
[0024] Figure 11 illustrates a front view depicting one embodiment of an apparatus for simultaneous testing of bevel gear set using universal testing machine, in accordance with an embodiment of the present subject matter.
[0025] Figure 12 illustrates the method for testing of bevel gear set using universal testing machine, in accordance with an embodiment of the present subject matter.
[0026] In the above accompanying drawings, a number relates to an item identified by a line linking the number to the item. When a number is accompanied by an associated arrow, the number is used to identify a general item at which the arrow is pointing.
[0027] Further, the figures depict various embodiments of the present subject matter 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 present subject matter described herein.

DETAILED DESCRIPTION
[0028] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising," "having," "containing," 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. It must also be noted that as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Although an apparatus and a method for testing of a straight bevel gear set using a universal testing machine, similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, an exemplary apparatus and method for testing of a straight bevel gear set using a universal testing machine.
[0029] Various modifications to the embodiment of the apparatus and method for testing of a straight bevel gear set using a universal testing machine will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. For example, although the present disclosure will be described in the context of an apparatus and a method for testing of a straight bevel gear set using a universal testing machine, one of ordinary skill in the art will readily recognize that Filter element having a central support tube can be utilized in any situation where there is need to perform gear testing. Thus, 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.
[0030] As elaborated, a bevel gear set can be imagined as a truncated cone comprising two gears side and pinnion. At its lateral side, teeth are milled which interlock to other gears with its own set of teeth. The gear transmitting the shaft power is called the driver gear, while the gear where power is being transmitted is called the driven gear. The number of teeth of the driver and driven gear are usually different to produce a mechanical advantage. The ratio between the number of teeth

of the driven to the driver gear is known as the gear ratio, while mechanical advantage is the ratio of the output torque to the input torque. As illustrated before testing of gear is critical function to ensure smooth working and performance of the gear. Conventional there exist numerous testing methodology for spur gear but same cannot be applied to bevel gears. Further, the testing methodologies and apparatus are bulky and highly complicated, requiring skilled resources to operate the machinery. For example, conventional apparatus discloses an inspection fixture for bevel gears, or the bevel gear tooth thickness inspection tool, completely different from the present subject matter.
[0031] In an aspect of the present disclosure, in order to overcome the above referenced problems and to provide various advantages elaborated in the subsequent section, an apparatus and method for testing, in particular root failure and fatigue failure i.e., static and fatigue strength, of a straight bevel gear set using a universal testing machine and applying load at Highest point of single tooth contact of the gear tooth is disclosed.
[0032] In the embodiment, the apparatus comprises a first element coupled to a movable arm of a universal testing machine, and a second element coupled to a static arm of the universal testing machine. In one example, the first element comprises a plate holding shaft, and one of a pinion tooth plate or a side gear tooth plate mounted on the plate holding shaft via nut and bolt, Further, the pinion tooth plate and a side gear tooth plate comprises one or more wedge tooth. In one more example, the second element comprises one of a pinion mounted on a pinion holding shaft, or a side gear mounted on a side gear holding shaft. Further, during testing one of the pinion tooth plate engages with the pinion or the side gear tooth plate engages with the side gear to transfer a compressive load from the universal testing machine to the highest point of single tooth contact in turn generating stress at root of the pinion and the side gear thereby testing the bevel gear set.
[0033] Embodiments of the present disclosure substantially eliminate, or at least partially address, problems in the prior art, and assist bevel gear manufacturers,

consumers, and suppliers. It should be noted that the above advantages and other advantages will be better evident in the subsequent description. Further, in the subsequent section the present subject is better explained with reference to the figures.
[0034] Referring now to the drawings, Figures. 1 to Figure 12 illustrate apparatus and method for testing of a straight bevel gear set using a universal testing machine according to present invention. It should be noted that Figure 1 to Figure 12 are merely an example. A person skilled in the art will recognize many variations, alternatives, and modifications of the embodiments of the present disclosure. Before proceeding with the description of the Figures 1 to Figure 12, Table 1 provided nomenclatures used in the Figures 1 to Figure 12.
Table1: Nomenclature used in figures

number name number name
100 set up for pinion testing 702 tooth slot
102 plate holding shaft 704 plate hole
104 nut 706 nut hole
106 pinion 708 plate shaft
108 pinion holding shaft 710 plate head
120 bolt 802 pinion head
202 pinion tooth plate 804 pinion shaft
204 cross pin 806 pin hole
302 wedge tooth 902 side head
400 set up for side gear testing 904 side shaft
402 side gear holding shaft 906 gear slot
502 side gear 908 slots
504 side gear tooth plate 1102 First mounting plate
602 wedge tooth 1104 Second mounting plate

[0035] Now referring to the figure, subsequent section describes various embodiment and configuration with reference to the figures.
[0036] As shown in Figure 1- Figurer 6, Figure 1 is a perspective view depicting one embodiment of an apparatus for testing of bevel gear set using universal testing machine, Figure 2 illustrate a sectional view of one embodiment of the apparatus for testing of bevel gear set using universal testing machine, Figure 3 is an exploded view of one embodiment of the apparatus for testing of bevel gear set using universal testing machine, Figure 4 illustrates an isometric view of another embodiment of the apparatus for testing of bevel gear set using universal testing machine, Figure 5 illustrates a sectional view of another embodiment of the apparatus for testing of bevel gear set using universal testing machine and Figure 6 illustrates an exploded view of another embodiment of the apparatus for testing of bevel gear set using universal testing machine, in accordance with an embodiment of the present subject matter. In order to avoided unnecessary repetition and maintain the brevity of the description the Figure 1 to figure 6 are described together
[0037] In one embodiment, an apparatus for testing of a straight bevel gear set, comprising a pinion 106 and a side gear 502, using a universal testing machine (UTM), is disclosed. In an example, the pinion 106 comprises 9 teeth and the side gear 502 comprises 13 teeth. In one example, the universal testing machine may be understood a machine is used to test the mechanical properties (tension, compression etc.) of a given test specimen by exerting tensile, compressive stresses on a part. The machine has been named so because of the wide range of tests it can perform over different kind of materials. The universal testing machine comprises a movable and a static arm.
[0038] Further, in the embodiment, the apparatus comprises a first element coupled to the movable arm of the universal testing machine and a second element coupled to a static arm of the universal testing machine.
[0039] In one implementation the first element comprises a plate holding shaft 102. In one example, a pinion tooth plate 202 may be mounted in other example, a side

gear tooth plate 504 mounted on the plate holding shaft 102 using nuts 104 and bolts 120. In one example, bolts 120 may be ISO4014-M12X60-5_6 and the nut 104 may be ISO4032-M12-6. Further, the number of nuts 104 and bolts 120 may be 10
[0040] Further, the pinion tooth plate 202 and a side gear tooth plate 504 comprises one or more wedge tooth 302, 602. In one example, the pinion tooth plate 202 and a side gear tooth plate 504 each comprise 2 wedge tooth 302, 602. In one implementation, wedge tooth 302, 602 geometry is designed such that the wedge tooth 302, 602 geometry is tangent to the Highest point of single tooth (HPSTC) contact line along the face width of gear under testing i.e., the pinion 106 and the side gear 502. In one example, HPSTC point of pinion and side gear is computed. Further, a circular tooth thickness at HPSTC points is computed. Furthermore, the wedge tooth 302, 602 are designed such that the wedge tooth 302, 602 and the pinion 106 the side gear 502, respectively touch each other only at the HPSTC. During operation the geometry of the wedge tooth 302, 602 enables the transfer of the compression load from the universal testing machine to the pinion 106 and the side gear 502 such that forces are generated over gear tooth on HPSTC of the pinion 106 and the side gear 502, in turn enabling testing for at least root failure. In other words, the engagement between the pinion 106 and the side gear 502 of the bevel gear set, which is at an angle, along with the forces generated during operation is mimicked by engagement and load transfer between the wedge tooth 302, 602 and the pinion 106 the side gear 502, respectively (linear load and engagement vs angular load and engagement)
[0041] Further, in the embodiment the second element comprises one of a pinions 106 mounted on a pinion holding shaft 108, or a side gear mounted 502 on a side gear holding shaft 402. The pinion holding shaft 108 comprises a pin hole 806, and the side gear holding shaft 402 comprises one or more slots 908 for providing clearance to the one or more wedge tooth 602.

[0042] During assembly for pinion 106 testing, the pinion tooth plate 202 is bolted on the plate holding shaft 102, and pinion 106 is mounted on the pinion holding shaft 108 using a cross pin 204.
[0043] During assembly for side gear 502 testing, side gear tooth plate 504 is bolted on the plate holding shaft 102, and the side gear 502 is mounted on the side gear holding shaft.
[0044] During testing the pinion tooth plate 202 engages with the pinion 106 or the side gear tooth plate 504 engages with the side gear 502 to transfer a compressive load from the universal testing machine to the highest point of single tooth contact (HPSTC) in turn generating stress at root of the pinion 106 and the side gear 502 thereby testing the bevel gear set. In one example, 4 tooth flanks are loaded at a time as contact between the pinion 106, the side gear 502 and the wedge tooth 302, 602 are at 4 tooth flanks. In another example, the pinion 106, the side gear 502 outer dimeter is machined to get proper concentricity, therapy enabling precise contact on HPSTC.
[0045] In one more example, compressive load is applied through plate holding shaft 106 with the help of UTM upper jaws, the pinion holding shaft 108 or the side gear holding shaft 402 is kept static while load application. Applied compressive load is equivalent to design torque. Further, due to the compressive force and wedge tooth 302, 602 geometry there is contact between pinion 106 flank and wedge tooth 302 flank during pinion 106 testing, and between the side gear 502 flank and the wedge tooth 602 flank during the side gear 502 testing, normal force is applied on HPSTC of bevel which generates equivalent stress at root. For the static test, bevel gear set is under compressive load until root failure and for fatigue testing gear is under certain number of cycles of certain load of equivalent torque
[0046] In one example, the testing comprises a static testing and a fatigue testing, Further, in the static testing the compressive load is increased until occurrence of a root failure and in the fatigue testing the compression load is increased and decreased for a predetermined cycle or until occurrence of a root failure.

[0047] In one example, the known parameter of differential torque is converted from Nm to mm-Kg. Further, the torque is converted into axial force at HPSTC by using below formulae
Tooth normal force Fn = 6 x T-eq/ ((20 x Rb x cos(α )) …………… ( 1)
Axial force Fa =4 x Fn x sin(α) x sin(Ф) …………….. (2)
Wherein:
• HPSTC: Highest point of single tooth contact
• Tct: Circular tooth thickness
• T-eq: Equivalent torque
• α: Pressure Angle
• Ф: Pitch cone angle
• Rb: Base circle radius
• Fn: Tooth Normal force
• Fa: Axial force
[0048] Now referring to next figure, Figure 7 illustrates a sectional view of a plate holding shaft 102, in accordance with an embodiment of the present subject matter. In one example, plate holding shaft 102 comprises a plate shaft 708 connected to plate head 710. Further, the plate head 710 comprises tooth slot 702 for receiving the pinion tooth plate 202 or the side gear tooth plate 502 during assembly. Furthermore, the plate head 710 comprises nut hole 706 for receiving the nuts and bolts to fix the pinion tooth plate 202 or the side gear tooth plate 502 during assembly. Additionally, the plate head 710 comprises plate hole for receiving the cross pin during assembly of the pinion 106, thereby locating and fixing the pinion 106 during testing.
[0049] Now referring to next figure, Figure 8 illustrates a sectional view a pinion holding shaft 108, in accordance with an embodiment of the present subject matter. The pinion holding shaft 108 comprises a pinion shaft 804 and a pinion head 802

joined to the pinion shaft 804. Further, the pinion head 802 comprises pin hole 806 to receive the assembly of cross pin 204 and pinion 106. In one example, pinion 106 has been placed on top of the pinion head 802 in the pin hole 806 and locked into position by the cross pin 204. In another example, the pin hole 806 has the exact profile pinion spherical radius. Further, the pinion shaft 804 is fixed in the UTM Jaws.
[0050] Now referring to next figure, Figure 9 illustrates top view of a side gear holding shaft 402, in accordance with an embodiment of the present subject matter. Figure 10 illustrates the sectional view the side gear holding shaft 402, in accordance with an embodiment of the present subject matter. In one example, the side gear holding shaft 402 comprises a side head 902 and a side shaft 904 joined to the side head 902. Further, the side head 902 comprises gear slot 906 to receive the side gear 502 and act as a holder for side gear 502. Further, side shaft 904 is placed in the UTM Jaws & Grooves are provided on theside shaft 904 for better grip. In one example, the side head 902 comprises slots 902 providing on collar for wedge tooth. As illustrated in the figure 9 the slots are at a particular angle due to the number of teeth on the side gear 502. In one implementation the location of the slot directly related to the number of teeth on the side gear 502.
[0051] Referring now to Figure 11, Figure 11 illustrates a front view depicting one embodiment of an apparatus for simultaneous testing of bevel gear set 1100 using universal testing machine, in accordance with an embodiment of the present subject matter. In the preceding embodiments the testing of pinion gear and side gear have been explained separately. In one embodiment, as shown in figure 11 both the testing of pinion gear and side gear of the bevel gear set may be done simultaneously, using the above-described apparatus. In order to maintain the brevity and readability the elements already described are not repeated, but only the new elements are described.
[0052] In one embodiment, the set up for pinion testing 100 and the set up for side gear testing 400 are mounted between a between a first mounting plate 1104 and

the second mounting plate 1102.Further, each of the first mounting plate 1104 and the second mounting plate 1102 comprises a cylindrical shaft. In one implementation, the first mounting plate 1104 is coupled to a moving arm of the UTM and the second mounting plate 1102 is coupled to the stationary arm of the UTM, via the cylindrical shaft. During operation, the forced applied by the UTM is transferred through the first mounting plate 1104 and towards the set up for pinion testing 100 and the set up for side gear testing 400 for testing.
[0053] Referring now to Figure 12, a method 1200 for testing of a straight bevel gear set is shown, in accordance with an embodiment of the present disclosure. The order in which the method 1200 is described is not intended to be construed as a limitation, and any number of the described method blocks can be combined in any order to implement the method 1200 or alternate methods. Additionally, individual blocks may be deleted from the method without departing from the spirit and scope of the disclosure described herein. Furthermore, the method 1200 can be implemented in any suitable hardware, firmware, or combination thereof. However, for ease of explanation, in the embodiments described below, the method may be implemented by use of the apparatus.
[0054] At block 1202, a first element is coupled to a movable arm of a universal testing machine. In on example, the first element comprises a plate holding shaft and one of a pinion tooth plate or a side gear tooth plate mounted on the plate holding shaft via nut and bolt. Further, the pinion tooth plate and a side gear tooth plate comprise one or more wedge tooth.
[0055] At block 1204, a second element is coupled to a static arm of the universal testing machine. In one more example, the second element comprises one of a pinion, of a bevel gear set, mounted on a pinion holding shaft, or a side gear mounted, of a bevel gear set, on a side gear holding shaft.
[0056] At block 1206, a testing is executed on the bevel gear set. Furthermore, during testing one of the pinion tooth plate engages with the pinion or the side gear tooth plate engages with the side gear to transfer a compressive load from the

universal testing machine to the highest point of single tooth contact in turn generating stress
[0057] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these following advantages may include.
[0058] Some embodiments of the present disclosure use a simple and cost-effective method to evaluate structural strength of the bevel gear set. Some embodiments of the present disclosure enable precise contact of bevel gear set and wedge tooth geometry. Some embodiments of the present disclosure enable cost effective and versatile technique for physical assessment of static and fatigue strength of simple bevel gear set. Some embodiments of the present disclosure are useful in comparative assessment of various geometries and gear alloys of simple bevel gear set. Some embodiments of the present disclosure UTM equipment is adequate for assessment. Some embodiments of the present disclosure eliminated the need to design and manufacture peripheral necessary to conduct strength assessment of gears on rotary test benches. Some embodiments of the present disclosure enable cost effective and meaningful simulation of abuse loading, special events and low cycle fatigue. Some embodiments of the present disclosure enable to initiate and augment institutional learning on the subject of simple bevel gear set, through data base creation.
[0059] Although the description provides implementations of an apparatus and a method for testing of a straight bevel gear set, it is to be understood that the above descriptions are not necessarily limited to the specific features or methods. Rather, the specific features and methods are disclosed as examples of implementations for an apparatus and a method for testing of a straight bevel gear set.

We Claim:
1. An apparatus for testing of a straight bevel gear set using a universal testing
machine, the apparatus comprising:
a first element coupled to a movable arm of a universal testing machine, wherein the first element comprises a plate holding shaft (102), and one of a pinion tooth plate (202) or a side gear tooth plate (504) mounted on the plate holding shaft (102) via nut (104) and bolt (120), and wherein the pinion tooth plate (202) and a side gear tooth plate (504) comprises one or more wedge tooth (302, 602);
a second element coupled to a static arm of the universal testing machine, and wherein the second element comprises one of a pinion (106) mounted on a pinion holding shaft (108), or a side gear mounted (502) on a side gear holding shaft (402); and
wherein during testing one of the pinion tooth plate (202) engages with the pinion (106) or the side gear tooth plate (504) engages with the side gear (502) to transfer a compressive load from the universal testing machine to the highest point of single tooth contact in turn generating stress at root of the pinion (106) and the side gear (502) thereby testing the bevel gear set.
2. The apparatus as claimed in claim 1, wherein the straight bevel gear set comprises the pinion (106) and the side gear (502).
3. The apparatus as claimed in claim 1, wherein the testing comprises a static testing and a fatigue testing, wherein in the static testing the compressive load is increased until occurrence of a root failure, wherein in the fatigue testing the compression load is increased and decreased for a predetermined cycle or until occurrence of a root failure.

4. The apparatus as claimed in claim 1, wherein the pinion holding shaft (108) comprises a pin hole (806), wherein during assembly the pinion (106) is mounted on the pinion holding shaft (108) using a cross pin (204), wherein one end of the cross pin (204) disposed inside the pin hole (806), and wherein during testing the cross pin (204) engages with the plate hole (704) disposed in the plate holding shaft (102).
5. The apparatus as claimed in claim 1, wherein the side gear holding shaft (402) comprises one or more slots (908) for providing clearance to the one or more wedge tooth (602) disposed on the side gear tooth plate (504) during operation.
6. A method for testing of straight bevel gear set using a universal testing machine, wherein the method comprises:
coupling a first element to a movable arm of a universal testing machine, wherein the first element comprises a plate holding shaft (102), and one of a pinion tooth plate (202) or a side gear tooth plate (504) mounted on the plate holding shaft (102) via nut (10) and bolt (120), and wherein the pinion tooth plate (202) and a side gear tooth plate (504) comprises one or more wedge tooth (302, 602);
coupling a second element to a static arm of the universal testing machine, and wherein the second element comprises one of a pinion (106), of a bevel gear set, mounted on a pinion holding shaft (108), or a side gear mounted (502), of a bevel gear set, on a side gear holding shaft (402); and
executing a testing on the bevel gear set, wherein during testing one of the pinion tooth plate (202) engages with the pinion (106) or the side gear tooth plate (504) engages with the side gear (502) to transfer a compressive load from the universal testing machine to the highest point

of single tooth contact in turn generating stress at root of the pinion (106) and the side gear (502) thereby testing the bevel gear set.
7. The method as claimed in claim 6, wherein the testing comprises a static testing and a fatigue testing, wherein in the static testing the compressive load is increased until occurrence of a root failure, wherein in the fatigue testing the compression load is increased and decreased for a predetermined cycle or until occurrence of a root failure.
8. The method as claimed in claim 6,
wherein the pinion holding shaft (108) comprises a pin hole (806), wherein during assembly the pinion (106) is mounted on the pinion holding shaft (108) using a cross pin (204), wherein one end of the cross pin (204) disposed inside the pin hole (806), and wherein during testing the cross pin (204) engages with the plate hole (704) disposed in the plate holding shaft (102); and
wherein the side gear holding shaft (402) comprises one or more slots (908) for providing clearance to the one or more wedge tooth (602) disposed on the side gear tooth plate (504) during operation.