FORM 2
THE PATENT ACT 1970
(39 & 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVENTION A Retention Arrangement for Rotating Parts
APPLICANTS
TATA MOTORS LIMITED, an Indian Company
having its registered office at Bombay House,
24 Homi Mody street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
INVENTORS
Mr. Janardhanan Venkatapathi
Indian National
Of Tata Motors Limited,
an Indian Company having its registered office
at Bombay House, 24 Homi Mody street,
Hutatma Chowk, Mumbai 400 001
Maharashtra, India
PREAMBLE TO THE DESCRIPTION
The following specification describes the invention.

FIELD OF THE INVENTION
The present invention relates to a retention arrangement for rotating parts, and more particularly to a coupling arrangement retaining the shaft and the part with coupling on one side of the shaft and restricting axial movement of the part in both the directions of the shaft.
BACKGROUND OF THE INVENTION
To retain parts on rotating or non rotating shafts, retention members like circlips are used. Conventional retaining arrangements involve placing the retaining rings such as circlip in a groove that has been machined into the exterior surface of a shaft or the interior surface of a bore. The retaining ring, as installed in its operating position in the groove, forms a shoulder that components ride up against, thereby, preventing the components from moving axially past the ring.
The circlips are mounted on the shaft, such that the circlip butts against the part thereby retaining the part on the shaft. Retaining rings are preferably removable. Accordingly, components on a shaft that are held in position by a retaining ring may be removed from the shaft by first removing the retaining ring and then sliding the components past the groove in which the retaining ring was positioned.
Referring FIG. 1, showing a sketch of a prior art, wherein a shaft (1) passes through a part (2). The part (2) is retained on the shaft (1) between a shoulder (IB) on the shaft (1) on one side and a retainer ring (3) mounted on the groove (1 A) on the shaft (1) on the other side. The shoulder formed on the shaft and the retainer ring (3) placed on the groove of the shaft holds the shaft (1) and the (2) part in an assembly retained position.
FIG. 2, shows another sketch of a prior art, wherein a shaft (1) passes through a part (2). The part (2) is retained on the shaft (1) between a retainer ring (3) mounted on the groove (1 A) on the shaft (1) on one side and a retainer ring (4) mounted on the groove

(1C) on the shaft (1) on the other side. The retainer ring (3) placed in assembly acts like a shoulder and restricts the axial movement of the part (2) from the shaft (1).
However, all these conventional arrangements the retaining will restrict the movement of the part only in one direction and when it is required to restrict the part in both the directions, two circlips located on either side of the part on the shaft is required, or a shoulder has to be formed on the shaft for restricting the axial movement of the shaft.
Further, the coupling or retaining means has to be provided on both side of the shaft for restricting the axial movement of the part on both the directions of the shaft. Moreover, these kinds of retention members are not helpful to restrict the movement of the shaft or the movement of part on the shaft in two directions when only one circlip or comparable means is used while the shaft is not passing through the part completely.
With respect to the conventional retention arrangement for the shaft and the part, it is necessary to provide an improved retention arrangement free from the above-mentioned disadvantages and the short comings involved in the conventional arrangements.
Therefore, it is desirable to provide an improved coupling arrangement retaining the shaft and the part with coupling on one side of the shaft and restricting axial movement of the part in both the direction of the shaft. Further, to provide a retention arrangement for a Part and shaft coupling where the shaft is not passing through the part completely.
OBJECTS OF THE INVENTION
The main object of the present invention is to provide an improved retention arrangement having coupling arrangement on one side of the shaft and restricting the

axial movement of the part in both the direction of the shaft.
Another object of the present invention is to provide an improved retention arrangement for a part and shaft coupling where the shaft is not passing through the part completely in order to retain the part.
Yet another object of the present invention is to provide an improved retention arrangement having restricting the axial movement of the part on the shaft in two directions.
Further object of the present invention is to provide improved retention arrangement using only one circlip and restricting the axial movement of the shaft in two directions.
Still further object of the invention is to provide an improved retention arrangement facilitating separation of part and shaft as an independent module for the purpose of ease of serviceability, assembly and disassembly.
SUMMARY OF THE INVENTION
The present invention which achieves the objectives, relates to a coupling arrangement for retaining a part on a shaft with retaining means on one side of the part and restricting the axial movement of the part in both the direction of the shaft. The shaft referred can be a rotating shaft or a non rotating shaft and the part can usually be a shaft enclosure or a shaft housing part like bearing housing etc.
The retention arrangement includes a shaft having annular grooves formed on the inner side at the end portion of the shaft and a part having a shoulder formed on the outer side and annular grooves formed on the inner side at the flange portion

protruding at the centre of the part. A coupling arrangement is provided for assembling the shaft and the part.
The coupling arrangement includes a set of semi circular couplings with two layered annular retaining lugs and a shoulder. The grooves formed on the shaft and the part receives the retaining lugs formed on the semi circular couplings for assembling the shaft with the part. The couplings are identical and similar coupling elements which are semi circular in profile and have two lugs each of which hold the part and the shaft together using the respective grooves formed on the flange portion of the part and in the grooves of the shaft.
A coupling sleeve provided with the coupling arrangement slides over the semi circular couplings and holds the couplings together. A retaining ring is secured for holding the coupling sleeve in position, such that the couplings are rigidly placed on the part and the shaft. The grooves formed on the flange portion part receives the retaining ring for holding the coupling sleeve in assembled position, and the coupling sleeve slide over the semi circular couplings and holds the couplings in assembled position with the shaft and the part. The coupling sleeve is held in place by the retaining ring and the shoulder on the couplings.
The retaining ring sits in the groove of the part after assembly of couplings and the coupling sleeve with the part and the shaft. The circular coupling sleeve holds both the coupling elements together against the part and the shaft. The retainer ring and the shoulders on the coupling elements are used to retain the coupling sleeve from sliding out of position. This arrangement allows for enabling retention on itself on both sides for the purpose of retaining the part.
The retention arrangement in accordance to the present invention allows for avoiding the need for the shaft to pass through the part completely. The circular coupling sleeve holds both the coupling elements together against the part and the shaft. This coupling

arrangement facilities separation of the part and the shaft as an independent module for the purpose of ease of serviceability, assembly and disassembly etc.
BRIEF DESCRIPTION OF THE DRAWINGS
Referring now to the drawings wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same.
Fig. 1 shows a coupling arrangement of a shaft having a shoulder formed on its end portion and a part retained using a retaining ring, in accordance to the prior art of the invention.
Fig. 2 shows another coupling arrangement of a shaft and a part having two retaining rings placed at both the ends of the part for assembling and retaining the part on the shaft.
Fig. 3 shows a schematic diagram of an improved part retention arrangement having shaft and the part assembled together, in accordance to the exemplary embodiment of the present invention.
Fig. 4 shows an exploded view of the part retention arrangement having couplings parts with an order of assembly, in accordance to the exemplary embodiment of the present invention.
Fig. 5 shows a view of the semi circular coupling of the improved retention arrangement having retaining lugs and annular shoulders formed, in accordance to the present invention.

Fig. 6 shows a view of illustrating the positioning and placement of the part with the shaft for assembling together, in accordance to the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a retention arrangement for retaining a part on a shaft through the coupling arrangement formed by the coupling and retaining elements. The present invention provides an improved retention arrangement having coupling arrangement on one side of the shaft and restricting the axial movement of the part in both the direction of the shaft.
Fig. 3 and 4 shows a schematic diagram of an improved part retention arrangement having a shaft and circular part, in the assembled view and in the exploded view of assembly in accordance to the exemplary embodiment of the present invention. Additionally referring to Fig. 5 & 6, the retention arrangement includes a shaft (100) having an annular groove (100A) formed on the outer side at the end portion of the shaft. The shaft (100) can be a rotating shaft or non rotating shaft.
The part (101) is provided with annular grooves (101 A) and (101B) on the outer side of the part. An annular shoulder (101D) is also formed on the outer side of the of the part (101). The part (101) can be circular part and usually shaft housing or a supporting parts such as bearing housing or wheel hub, etc. The part (101) can be a rotating part or a non rotating part. The part (101) assembles with the shaft (100) and retained through the retention arrangement.
A coupling arrangement is provided for assembling the shaft (100) and the part (101). The coupling arrangement includes a set of semi circular couplings (102) with two layered annular retaining lugs (102A) and (102B) and an annular shoulder (102C). Fig. 5 shows a view of the semi circular coupling of the improved retention arrangement, in accordance to the present invention. The retaining lugs (102A) and

(102B) are formed with an offset distance and in a layered profile such that the retaining lugs (102B and 102A) will perfectly sit on the grooves (100A and 101A) formed in the shaft (100) and the part (101) respectively and makes assembly retention of the part and the shaft.
The annular shoulder (102C) is formed on the outer circumferential portion of the semi circular couplings (102) for enabling the secured assembly of the couplings (102). The two semi circular couplings (102) are similarly formed with retaining lugs (102A) and (102B) and a shoulder (102C). The offset distance and layered profile of the retaining lugs enables assembly, such that the retaining lugs will perfectly sits on the grooves (100A) and (101A) available in the shaft (100) and the part (101) respectively and makes retention of the part and the shaft.
A coupling sleeve (103) is provided with the coupling arrangement and arranged to slide over the semi circular couplings (102) such that the semicircular coupling (102) retains the shaft (100) and the part (101) and the coupling sleeve (103) secures the couplings (102) in assembled position. A retaining ring (104) is placed in the annular groove (101B) for holding the coupling sleeve (103) in position, such that the couplings fixedly retains the part and the shaft in assembled position.
Fig. 6 shows a view illustrating the positioning and placement of the circular part with the shaft for assembling together, in accordance to the present invention. The part (101) and the shaft (100) are positioned to a required assembly form, such that the grooves (100A and 101 A) formed on the shaft and the part respectively receives the annular retaining lugs (102B) and (102A) formed on the semi circular couplings (102) for assembling the shaft with the part. The coupling sleeve (103) holds the semi circular couplings (102) together, a retaining ring (104) and a shoulder (102C) on semi circular couplings (102) for holding the coupling sleeve (103) in the position.

In assembly, the grooves (100A) and (101A) formed on the shaft (100) and the part (101) receives the retaining lugs (102B) and (102A) formed on the semi circular couplings (102) for assembling the shaft with the part. The two couplings (102) are identical and similar coupling elements which are semi circular in profile and the two lugs (102A) and (102B) each of which holds the part and the shaft together using the respective grooves (101A) and (100A) formed on the part and the shaft.
The retaining lug (102A) of coupling (102) sits in the groove (101A) of the part (101), and the retaining lug (102B) of coupling (102) sits in the groove (100A) of shaft (100). Both the semi circular couplings (102) are assembled on the part (101) and shaft (100) by locating the lugs (102A, 102B) in the corresponding grooves on the part (101A) and the shaft (100A) respectively.
The coupling sleeve (103) holds both the semi circular couplings (102) against the part (101) and the shaft (100). The coupling sleeve (103) is held in place by the retaining ring (104) and the shoulder (102C) on the couplings. The part (101) receives the retaining ring (104) for holding the coupling sleeve (103) in assembled position, and the coupling sleeve (103) slide over the semi circular couplings (102) and holds the couplings in assembled position with the shaft (100) and the part (101). The retaining ring (104) sits in the groove (101B) of part (101.) after assembly of couplings (102), coupling sleeve (103) with part (101) and the shaft (100). The coupling sleeve (103) is held in place by the retaining ring (104) and the shoulder (102C) on the couplings (102).
The retaining ring (104) is first placed on shoulder (101D) of part (101), and then followed by coupling sleeve (103), before the assembly of couplings (102), if the shoulder (101D) of the part (101) is not accessible from the part side. After assembly of couplings (102), the coupling sleeve (103) slide over the couplings (102), followed by the sliding of retaining ring (104) into the groove (101B) on part (101).

The retaining ring sits in the groove of the part after assembly of couplings and the coupling sleeve with the part and the shaft. The circular coupling sleeve holds both the coupling elements together against the part and the shaft. The retainer ring and the shoulders on the coupling elements are used to retain the coupling sleeve from sliding out of position. This arrangement allows for enabling retention on itself on both sides for the purpose of retaining the part.
The retention arrangement in accordance to the present invention allows for avoiding the need for the shaft to pass through the part completely. The circular coupling sleeve holds both the coupling elements together against the part and the shaft. This coupling arrangement facilities separation of the part and the shaft as an independent module for the purpose of ease of serviceability, assembly and disassembly etc.
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof.

We Claim:
1. A retention arrangement for rotating parts (100 and 101), comprising,
a coupling arrangement includes a set of semi circular couplings (102) with two layered annular retaining lugs (102B and 102A) and a shoulder (102C), said retaining lugs (102B and 102A) located in the grooves (100A & 101 A) formed on said rotating parts (100 and 101) for assembling;
a coupling sleeve (103) configured to slides over the couplings (102) and holds the couplings together; and a retaining ring (104) secured for holding the coupling sleeve (103) in assembled position.
2. The retention arrangement as claimed in claim 1, wherein the grooves
(101B) formed on the rotating part (101) receives the retaining ring (104) for
holding the coupling sleeve (103) in assembled position.
3. The retention arrangement as claimed in claim 1, wherein the retaining ring (104) sits in the groove (101B) of the rotating part (101) after assembly of couplings (102) and the coupling sleeve (103) with the rotating parts.
4. The retention arrangement as claimed in claim 1, wherein the retaining ring (104) and the shoulder (102C) formed on the semi circular couplings (102) retain the coupling sleeve (103) from sliding out position.
5. The retention arrangement as claimed in claim 1, wherein the coupling sleeve (103) is held in place by the retaining ring (104) and the shoulder (102C) on the couplings (102).
6. The retention arrangement as claimed in claim 1, wherein the part
(101) is a circular housing or closure member.

7. The retention arrangement as claimed in claim 1, wherein the retaining
ring(104)is a circlip.
8. The retention arrangement as claimed in claim 1, wherein the part (100) is
a rotating shaft or a non rotating shaft.