FORM 2
THE PATENT ACT 1970 (as amended)
[39 OF 1970]
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
[See Section 10 and Rule 13]
TITLE: "A SYSTEM FOR TESTING DURABILITY OF A BEARING AND
METHOD THEREOF"
Name and address of the Applicant:
TATA MOTORS LIMITED, an Indian company, having its registered office at Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001, Maharashtra, INDIA.
Nationality: INDIAN
The following specification particularly describes the invention the manner in which it is to be performed.

TECHNICAL FIELD
Embodiments of the disclosure relate to a system for bearing testing. More particularly, embodiments relate to the system for testing durability of pilot bearing.
BACKGROUND OF DISCLOSURE
In automobiles the pilot bearings are needle roller bearings. During vehicle movement, the pilot bearing shaft and housing rotate at different speed leading to generation of slip of rollers of pilot bearing. Due to torque / force transfer, the pilot bearings are subjected to radial loading. Hence, the bearing should be tested for its durability before using the same in the vehicle.
The conventional needle roller bearing test setup has fixed bearing housing and rotating bearing shaft. Radial force on the bearing is applied using spring loaded or pneumatic mechanism. This mechanism apply load on to the bearing housing which transfers this to the test bearing. Hence, the set up does not simulate the working condition of the pilot bearing in transmission.
In light of forgoing discussion, it is necessary to provide a system for testing the pilot bearing which simulate the working condition of the pilot bearing in transmission and perform durability test.
STATEMENT OF THE DISCLOSURE
Accordingly, the present disclosure provides a system for testing durability of a bearing, said system comprising: a test bench configured to form a base of the system, said test bench consists of a base plate mounted on test floor and a pair of columns at either ends of the base plate; a shaft mounted on one column of the test bench, wherein a bearing to be tested is mounted on one end of the shaft; a housing shaft mounted on other column of the test bench such that the outer circumference of the test bearing rests inside a housing mounted on one end of the housing shaft; pair of pulleys mounted on free ends of the shaft and the housing shaft; and a load applying means mounted on top of the test bench and in between the columns to apply radial load on to the test bearing and also provides for a method of conducting a durability test on a bearing, said method comprising acts of:

rotating a shaft and a housing shaft by connecting pulleys mounted on the shaft and the housing shaft to a pair of motors, wherein a bearing to be tested is mounted on one end of the shaft and is rests inside a housing mounted on one end of the housing shaft; and applying radial load on the bearing through a load applying means, wherein a ball bearing is provided in-between the housing and the load applying means to transfer the load from load applying means to the housing.
SUMMARY OF THE DISCLOSURE
The shortcomings of the prior art are overcome and additional advantages are provided through the provision of system and method as claimed in 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 as part of the claimed disclosure.
One embodiment of the present disclosure provides a system for testing durability of a bearing. Said system comprising a test bench configured to form a base of the system, said test bench consists of a base plate mounted on test floor and a pair of columns at either ends of the base plate. A shaft mounted on one column of the test bench, wherein a bearing to be tested is mounted on one end of the shaft. A housing shaft mounted on other column of the test bench such that the outer circumference of the test bearing rests inside a housing mounted on one end of the housing shaft. Further, pair of pulleys mounted on free ends of the shaft and the housing shaft. And a load applying means mounted on top of the test bench and in between the columns to apply radial load on to the test bearing.
In one embodiment of the present disclosure, the pulleys are connected to motors for rotating the shaft and housing shaft at different speeds for generating a bearing slip.
In one embodiment of the present disclosure, the shaft and the housing shaft are mounted on columns using ball bearings to prevent the deflection of the shaft and housing shaft during testing.

In one embodiment of the present disclosure, the load applying means is selected from at least one of spring loaded mechanism and pneumatic mechanism.
In one embodiment of the present disclosure, a ball bearing is provided in between the housing and the load applying means to transfer the load from load applying means to the housing.
In one embodiment of the present disclosure, a load cell is provided in the load applying means to measure the radial load applied on the bearing.
In one embodiment of the present disclosure, packing's are provided on both sides of the ball bearing to maintain uniform axial position of the ball bearing during the test.
In one embodiment of the present disclosure, the housing is provided with a hole on its surface to supply oil to the test bearing during testing.
Another embodiment of the present disclosure provides a method of conducting a durability test on a bearing. Said method comprising steps as fallows, a shaft and a housing shaft are rotated by connecting pulleys mounted on the shaft and the housing shaft to a pair of motors, wherein a bearing to be tested is mounted on one end of the shaft and is rests inside a housing mounted on one end of the housing shaft. And a radial load is applied on the bearing through a load applying means, wherein a ball bearing is provided in-between the housing and the load applying means to transfer the load from load applying means to the housing.
In one embodiment of the present disclosure, the shaft and housing shaft are rotated at different speeds to generate baring slip.
In one embodiment of the present disclosure, oil is supplied to the bearing through oil hole provided in the housing for lubricating the bearing during testing.
The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further

aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
OBJECTIVES OF THE DISCLOSURE
One object of the present disclosure is to provide a system for bearing testing which simulate working condition of pilot bearing and perform durability test.
One objective of the present disclosure is to provide system for bearing testing, which facilitates in evaluation of production lot transmission bearing and ensure manufacturing variance in short period of time.
One objective of the present disclosure is to provide system for bearing testing, which requires less time for testing various test units and also is easy to handle.
BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:
FIG. 1 illustrates a sectional view of baring test setup.
FIG. 2 illustrates a sectional view of test bearing, shaft, housing shaft, housing, and load applying means of 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
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 present disclosure.
To overcome the drawbacks mentioned in the background a system for conducting durability test on bearing is disclosed. The system simulates the actual working condition of the bearing, hence better results of durability is obtained from the system.
FIG.l is an exemplary embodiment which illustrates a system (100) for testing a durability test of a bearing. The system comprises a test bench (101) configured to form a base of the system (100). The test bench (101) consists of a base (101a) mounted on test floor and a pair of columns (101b and 101c) mounted on either sides of the base (101a) of the test bench (101) for supporting a shaft (102) and a housing shaft (104). A bearing to be tested (103) mounted on shaft (102) and held in a housing (104a) of the housing shaft (104). The shaft (102) mounted on column (101b) of the test bench (101) through a ball bearing (106), and a pulley (105) is mounted on the shaft (102). The housing shaft (104) is mounted on column (101c) of the test bench (101) using ball bearing (106), and a pulley (105) is mounted on housing shaft (104). A load applying means (106) is mounted

on top of the test bench (101) and in between the columns (101a 101c) for applying the radial load on the bearing (103) to be tested. A ball bearing (108) is provided in between the housing (104a) and the load applying means (106) to transfer the load from load applying means (106) to the housing (104a), In one embodiment, the load applying means (106) is selected from the group but not limited to spring load mechanism and pneumatic load mechanism.
The bearing (103) to be tested mounted on shaft (102) and the shaft (102) have surface hardness, surface roughness and tolerance same as that bearing (103). The bearing (103) is held in housing shaft (104) having surface hardness, surface roughness and tolerance same as that of bearing (103).
The shaft (102) is supported on test bench (101) through ball bearing (107) to prevent deflection of shaft (102) during test. The pulley (105) is mounted on the shaft (102) to rotate the shaft (102) through a motor at specified speed. Housing shaft (104) is supported on test bench (101) using ball bearing (106) to avoid deflection of housing shaft (104) during test. The pulley (105) is mounted on housing shaft (104) to rotate housing shaft (104) at specified speed. Since, shaft (102) and housing shaft (104) are run through different motor and pulley (105) sets the bearing slip is generated.
The ball bearing (106) provided between the load applying means (108) and the housing (104a) to transfer the load from load applying means (108) to the housing (104) which in turn applies the radial load onto the bearing (103) to be tested. In order to ensure axial position of ball bearing (108) during testing packaging's (109) are provided on shaft (102) and housing shaft (104) on either side of ball bearing (108). Ball bearing (108) is held by the load applying means such a way that its outer race is free to rotate about its axis.
To provide lubrication to bearing (103) during testing, oil hole (110) is provided on surface of the housing (104a) through which oil is supplied onto the bearing (103) for lubrication. Oil is supplied to the oil hole (110) through splash lubrication. Lubrication rate can be adjusted using suitable oil catcher. System is filled with required quantity of

oil before start of test. This oil will be stored on the bottom portion of test bench (101), through which splash lubrication can take place.
FIG. 2 is an exemplary embodiment which illustrates a sectional view of test bearing (103), shaft (102), housing shaft (104), housing (104a), and load applying means (106). The load applying means (106) is selected from a group but not limited to spring loaded mechanism and pneumatic mechanism. In one embodiment, the spring loaded mechanism comprises a shaft (106a) in between the columns (101b and 101c) connected to a ball bearing (108) through suitable means. A lock nut (106b) is connected to the shaft (108a) such that it can be tightened and/or loosen onto the test bench housing (101). And a compression spring (106c) is held between shaft (106a) and lock nut (106b), to apply radial load on ball bearing (108). The lock nut (106b) is tightened and/or loosens onto the test bench housing (101) to adjust the radial load on test bearing (103) depending on the requirement. A load cell is provided in between the compression spring (106c) and lock nut (106b) to verify compression load / radial load on test bearing (103) during test. Further, depending on the test requirements the lock nut (8) can be adjusted to maintain constant load on test bearing (103).
The system for conducting durability of the test bearing has fallowing advantages:
The present disclosure provides a system for conducting durability test of bearing in which simulates actual working condition of the bearing by generating a bearing slip.
The present disclosure provides a system for conducting durability test of bearing which is simple in construction and economical.
The present disclosure provides a system for conducting durability test of bearing, which is quick, fairly accurate results is obtained and requires no special testing skills and/or high investment, thus, effectively reducing overhead cost for the product.
The present disclosure provides a system for conducting durability test of bearing, which is made common for wide range of automotive transmission pilot bearing without requiring any change, except change in test bearing shaft and housing.

The present disclosure provides a system for conducting durability test of bearing, which is small and can be easily located to other location if required.
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.
Referral Numerals;

Reference Number Description
100 System for bearing testing
101 Test bench
101a Base plate of the test bench
101b and 101c Columns of the test bench
102 Shaft
103 Test bearing
104 Housing shaft
104a Housing
105 Pulleys

106 Load applying means
106a Shaft of the load applying means
106b Nut
106c Spring
107 Ball bearings for supporting the shaft and housing shaft
108 Ball bearing between load applying means and housing
109 Packing's
110 Oil hole

We claim
1. A system (100) for testing durability of a bearing, said system comprising:
a test bench (101) configured to form a base of the system, said test bench (101) consists of a base plate (101a) mounted on test floor and a pair of columns (101b and 101c) at either ends of the base plate (101a);
a shaft (102) mounted on one column (101b) of the test bench (101), wherein a bearing (103) to be tested is mounted on one end of the shaft (102);
a housing shaft (104) mounted on other column (101c) of the test bench (101) such that that the outer circumference of the test bearing (103) rests inside a housing (104a) mounted on one end of the housing shaft (104);
pair of pulleys (105) mounted on free ends of the shaft (102) and the housing shaft (104); and
a load applying means (106) mounted on top of the test bench (101) and in between the columns (101b and 101c) to apply radial load on to the test bearing (103).
2. The system as claimed in claim 1, wherein the pulleys (105) are connected to motors for rotating the shaft (102) and housing shaft (104) at different speeds for generating a bearing slip.
3. The system as claimed in claim 1, wherein the shaft (102) and the housing shaft (104) are mounted on columns (101b and 101c) using ball bearings (107) to prevent the deflection of the shaft (102) and housing shaft (104) during testing.
4. The system as claimed in claim 1, wherein the load applying means (106) is selected from at least one of spring loaded mechanism and pneumatic mechanism.
5. The system as claimed in claim 1, wherein a ball bearing (108) is provided in between the housing (104a) and the load applying means (106) to transfer the load from load applying means (106) to the housing (104a).

6. The system as claimed in claim 1, wherein a load cell is provided in the load applying means (106) to measure the radial load applied on the bearing (103).
7. The system as claimed in claim 1, wherein packing's (109) are provided on both sides of the ball baring (108) to maintain uniform axial position of the ball bearing (108) during the test.
8. The system as claimed in claim 1, wherein the housing (104a) is provided with a hole (110) on its surface to supply oil to the test bearing (103) during testing.
9. A method of conducting a durability test on a bearing (103), said method comprising acts of:
rotating a shaft (102) and a housing shaft (104) by connecting pulleys
(105) mounted on the shaft (102) and the housing shaft (104) to a pair of motors,
wherein a bearing (103) to be tested is mounted on one end of the shaft (102) and
is rests inside a housing (104a) mounted on one end of the housing shaft (104);
and
applying radial load on the bearing (103) through a load applying means (106), wherein a ball bearing (108) is provided in-between the housing (104a) and the load applying means (106) to transfer the load from load applying means
(106) to the housing (104a).
10. The method as claimed in claim 9, wherein the shaft (102) and housing shaft (104) are rotated at different speeds to generate baring slip.
11. The method as claimed in claim 9, wherein oil is supplied to the bearing (103) through an oil hole (110) provided in the housing (104a) for lubricating the bearing (103) during testing.

12. A system for testing durability of a bearing and method of conducting a durability test on a bearing are substantially as herein above described and as illustrated in accompanying drawings.