'
FORM 2
THE PATENT ACT 1970
(39 OF 1970)
&
The Patent Rules, 2003
PROVISIONAL/COMPIETE SPECIFICATION Shaft of Gear Box

(See section 10 and rule 13}

TITLE OF THE INVENTION: Device for Removal of Spline
Assembly in Aircraft

2. APPLICANT(S) (a) NAME:
Hindustan Aeronautics Limited
(b) NATIONALITY: INDIAN
(c) ADDRESS
Hindustan Aeronautics Limited, Ojhar, Nashik, Maharashtra, India

3. PREAMBLE TO THE DESCRIPTION
PROVISIONAL
x
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.
4. DESCRIPTION (Description shall start from next page.)
Refer Annexure-1
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5. CLAIMS (not applicable for provisional specification. Claims should start with the preamble—"I/We Claim" on separate page.) Refer Annexure-ll
6. DATE AND SIGNATURE (to be given at the end of last page of specification)
7. ABSTRACT OF THE INVENTION (to be given along with complete specification on separate page)= Refer Annexure-ll!
Note: - * Repeat boxes in case of more.than one entry.
* To be signed by the applicant(s) or by authorized registered patent agent otherwise where
mentioned.
* Name of the inventor and applicant should be given in full, family name in the beginning.
*Complete address of the inventor and applicant should be given stating the po.stal index
no./code, state and country.
*Strike out the column which is/are not applicable.

Complete Specification
Of
Device for Removal of Spline Shaft of Gear Box Assembly in Aircraft

1. Title of the invention
Title of invention: Device for the removal of spline shaft of Gear Box Assembly in aircraft
2. Field of invention:
The present invention relates to an apparatus for the removal of shaft which connects Aircraft Gear Box Assembly (GBA) to pumps mounted on it.
3. Background of invention
Aircrafts are overhauled after predetermined no. of flights for its life extension. During the process of overhaul, several units are required to be dismantled from the aircraft. GBA is one.of the units required to be disassembled from the aircraft.
GBA (2) is a gearbox assembly that forms part of a gas turbine engine (1). It drives the various accessories viz. fuel pumps (3), hydraulic pumps (5j, generator (4) etc. that are otherwise essentia! for the operation of engine of the aircraft where it is mounted. During dismantling of aircraft all the pumps are to be removed from it. The schematic view of GBA with mounted pumps is shown in the fig. no. 1.
Splines (6) are grooves or teeth on a shaft that match up with groove or teeth on another component to transmit torque. While removing the spline shaft from GBA (2) for dismantling as mandatory requirement for overhaul. The removal process is very time consuming due to interference fits, dirt and corrosion in shaft and also requires operator with special skill to do the job. Also a defined process is not available for removal of shaft, which results in damage of shaft and gear box assembly; resulting in non-availability of gear box for aircraft which in turn increases aircraft down time.
4. Prior art description and their limitation
Presently there are three jaw and four jaw pullers available for the removal of threaded shafts. The inventions in the related field are US 20150101168A1 and US 3087236A .But for the removal of spline shafts there is no specific tool.

5. Summary of the present invention
To address the above problem a special tool is designed. The shaft puller device described herein includes ' two separate plates (15) & (16) that are attached with screw (10) & (11) .On each plate studs (7) &(9) are mounted on plate (15 )&(16) . A groove (8) made on the plate so that shaft can be inserted in that. The shaft to be removed is inserted in the groove. After that screws of plates are tightened. After insertion of shaft in the slot studs (13) are tightened with the help of rotating pins 16). A force mounted on the clamping device allows a force to be applied on the shaft in a direction parallel to the axis of shaft. Clamping force provided by the two fastening members combines the tool and shaft into one integrated unit. When the studs are tightened the shaft tend to remove out from the body of AAGB saving time and efforts.
The device and process will be applicable for other aircraft's having AGB and their accessories.
6. DETAILED DESCRIPTION OF DRAWING
Drawing for AGB connected to various accessories
In the schematic drawing Gear Box assembly with pumps mounted on it is shown which are attached with spline shaft. The spline shaft is to be removed from the newly devised tool.
Drawing for the newly devised tool used for the removal of shaft.
Figure no. 2 & 3 consists of plate, studs, screws and rotating pin. There are two holes (10) & (11) on the side of the plate .They are attached through screws.,A groove (8) and (12) is made on the plate in which shaft (6) can be inserted. There are two holes on the opposite sides of plate in which two studs are mounted, There is a hole on the stud in which a pin (16) for rotating is attached. The device evolved was. used in a fighter-aircraft. It was found that the shaft removal using the evolved tool was less.fatigue as compared to existing procedure. Also, No damage to the shaft and the body of AGB and shafts was noticed. The process adopted with the device resulted in time and cost saving. The use of device and process is easy, universal and eco-friendly.

INNOVATION DECLARATION FORM (IDF)

Title of Invention Device for removal of spline shaft of Gear Box Assembly
in aircraft
BACKGROUND AND PRIOR ART
Background of Invention (origin of invention or the problem to which the Aircrafts are overhauled after predetermined no. of flights for its life
invention is a solution for) -extension. During the process of overhaul, several units are required to be dismantled from the aircraft. GBA is one of the units required to be disassembled from the aircraft.
GBA (2) is a gearbox assembly that forms part of a gas turbine engine (1). It drives the various accessories viz. fuel pumps (3), hydraulic pumps (5), generator (4) etc. that are otherwise essential for the operation of engine of the aircraft where it is mounted. During dismantling of aircraft all the pumps are to be removed from it. The schematic view of GBA with mounted pumps is shown in the fig. no. 1. Splines (6) are grooves or teeth on a shaft that match up with groove or
teeth on another component to transmit torque. While removing the
i spline shaft from GBA (2) for dismantling as mandatory requirement for
overhaul. The removal process .is very time consuming due to
interference fits, dirt and corrosion in shaft and also requires operator
with special skill to do the job. Also a defined process is not available for
removal of shaft, which results in damage of shaft and gear box assembly,
resulting in - non-availability of gear box for aircraft which in turn
increases aircraft down time.
Presently there are three jaw and four jaw pullers available for the
removal of threaded shafts. But for the removal of spline shafts there is
no specific tool.
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Existing Inventions in the same (literature available) field Patent no. -US20150101168A1 US3087236A
Limited for threaded shafts and can not be used for the removal of Gear
Drawback of the existing inventions oox assembly of aircraft

Testing (Has the invention been tested) IWith the help of this invention shaft of the Gear Box Assembly has been removed while dismantling of aircraft without any damage to the component.
Is the invention available as a manufactured Yes
product (If yes/provide details) Invention has been trailed while dismantling of aircraft
Does the process/product have industria applicability [Yes Invention is trailed successfully and it has industrial applicability.
ADDITIONAL PARAMETERS FOR OBTANING IP PROTECTION
Is the invention already in use on any platform of HAL (If so, then since when) No
Has it been published or demonstrated anywhere else/is it planned to be published or presented anywhere in the near future (details to be provided) No
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Description of invention To address the above problem a special tool is designed. The shaft pullerl device described herein includes two separate plates (15) & (16) that are attached with screw (10) & (11) .On each plate studs (7) &(9) are mounted on plate (15 )&(16) . A groove (8) made on the plate so that shaft can be inserted in that, shaft to be removed is inserted in the groove. After that screws of plates are tightened. After insertion of shaft in the slot studs (13) are tightened with the help of rotating pins 16). A force mounted on the clamping device allows a force to be applied on the shaft in a direction parallel to the axis of shaft. Clamping force provided by the two fastening members combines the tool and shaft into one integrated. When the studs are tightened the shaft tend to remove out from the body of GBA saving time and efforts.
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Methodology for construction of invention (if applying for a product patent). Device for pulling the shaft is made up of two plates, two studs, two screws,
two pins
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CRITERIA FOR OBTAINING IP PROTECTION

Novelty (features that make the invention novel) l.Can be applied for spline shafts 2.Not skill specific
Inventive step (are the novel features inventive enough to not be obvious to a person skilled in the art) Can be used for the removal of spline shaft


SI. No. INVENTOR(S) DETAILS
1 Name PRASHANT KUMAR JHA
Designation Manager
■ Dept No./PB No. Department 092/14967
Name Division AMD NASHTK
Phone number 7507589979
2 Name DHIRA] PITAMBAR VARANKAR
Designation Master Technician
Devt/PB. No. 093/104811
Division AMD, NASHIK
Cell 9403410625

Declaration Statement/NOC
1; 1/We declare that all statements made herein are true to the best of my/our knowledge.
2. I/We hereby declare that, I/We have read the IPR Policy 2021 and are in agreement with the contents therein.
3. I/We hereby agree to assign all rights, title and interest to Hindustan Aeronautics Limited and agree to execute all documents as requested, assigning to Hindustan Aeronautics Limited, my/our rights in any IPR filed on this invention, and to cooperate in the protection of this invention, and its subsequent commercialization.
4. I/We hereby agree to retain all necessary documentation and provide the same to the Organization in order to enable the organization to pursue IP protection for the invention,
5. I/We hereby agree to. refrain from making any publication/public use of the invention that can prejudice the organization's ability to pursue IP protection under applicable laws.
6. 1/ We hereby agree that the obligations mentioned herein continue irrespective of severance of employer-employee relationship between HAL and the undersigned.

I/We Claim:
1. A device for the removal of shaft connecting Gear Box Assembly (GBA) to pumps
comprises of:
>
- Base Plate (15) ;the plate for shaft to be removed is inserted
- Studs (13); for mounting on the body of AGB
- Screws(14); for the plates to be joined
- Pins(16); for rotating the studs
- the device consists of two separate plates attached through screws to connect the plate through and through ;
- There are two holes on the opposite ends of plate for studs to be mounted. There are holes on the studs for rotating pins to be inserted.

2. The apparatus for removal of the shaft as claimed in Claim 1, wherein the length of the plate in this case ranging from 200 mm to 300 mm;
3. The apparatus for removal of the shaft as claimed in Claim 1, wherein the width of the plate ranges from 40.mm to 70 mm.

4. The apparatus for removal of the shaft as claimed in Claim 1, wherein the thickness of the plate ranges from 12.mm to 15 mm.
5. The apparatus for removal of the shaft as claimed in Claim 1, wherein the plate has a circular stepped groove at the near center of the plate.
6. The apparatus for removal of the shaft as claimed in Claim 5, wherein the groove has a radius ranging from 4.mm to 6 mm.
7. The apparatus for removal of the shaft as claimed in Claim 1, wherein the plate is made of the material selected from the group consisting of Aluminum, Magnesium.