Title of Invention

A GEAR TRAIN IN TRACTION ALTERNATOR FOR DIESEL ELECTRIC LOCO FOR TRANSMISSION OF ROTARY MOTION TO AUXILIARIES.

Abstract The present invention relates to an improved gear-train arrangement with traction alternator.More particularly,the present invention relates to an improved geartrain arrangement coupled with a main gear attached to shaft of traction alternator which in turn transmit power to the auxiliaries comprising one auxiliary generator,one exciter,one power take off unit(PTU)and one idle gear assembly,adaptable to all types of diesel electric loco.
Full Text 2 FILED OF THE INVENTION
The present invention relates to an improved gear-train arrangement with traction alternator. More particularly, the present invention relates to an improved gear-train arrangement coupled with a main gear attached to shaft of traction alternator which in turn transmit power to the auxiliaries comprising one auxiliary generator, one exciter, one power take off unit (PTU) and one idle gear assembly, adaptable to all types of diesel electric loco.
BACK GROUND OF THE INVENTION
In a locomotive the traction alternator is coupled to the diesel engine. The electrical power generated by traction alternator is fed to tractor motor through control equipments. Besides that power is also required to operate for starting of diesel Engine, exciting of field of alternator, for lighting in locomotive and for charging battery. The particular demand of power is meted out by auxiliary generators and exciter. While the .locomotive is on running condition, the cooling of traction motor is accomplished though a blower mounted on power take off unit. These auxiliary generators and a power take off unit gets its drive from gear train arrangement which is a unique arrangement in the alternator used for traction application.
A prior Art discloses, the power transmission from the generation shaft to its auxiliaries is performed by a belt drive which comprising -V belts & pully with suitable grooves cut into it on which V- belts operate. The disadvantages of V-belt drive (1) reduce service life due to improper belt tensioning, (2) mismatching of belt lengths resulting in transmission loses. (3). V-belts are also subjected to certain amount of creep, so the velocity ratio required between driver and drive pully was not constant.
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In addition, with the V-belt drive, a proper alignment of bearing is required with respect to one another in different auxiliary generators, power take off unit and to main generator shaft since misalignment of the bearing can also cause wobbling, vibration, excessive bearing wear and result in premature failure.
OBJECTS OF THE INVENTION
It is therefore, an object of the present invention to propose an improved gear-train arrangement coupled with a main gear attached to the shaft of traction alternator which eliminates the disadvantages of prior art.
Another Object of the present invention is to propose an improved gear-train arrangement coupled with a main gear attached to the shaft of traction alternator which performs a positive drives and a maintains a constant speed ratio without any slippage.
A yet another Object of the present invention is to propose an improved gear-train arrangement coupled with a main gear attached to the shaft of traction alternator which help to drive compactly using minimum centre distance causing reduction in size of alternator.
A further Object of the present invention is to propose an improved gear-train arrangement coupled with a main gear attached to the shaft of traction alternator which operate with high efficiency, and reliable in servicing and simple in operation.
A still further Object of the present invention is to propose an improved gear-train arrangement coupled with a main gear attached to the shaft of traction alternator which is inexpensive in maintenance due to proper lubrication arrangement of gear and pinions by providing a sump containing lubricated oil at a certain level.
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A yet further Object of the present Invention is to propose an improved gear-train arrangement coupled with a main gear attached to the shaft of traction alternator which provides gear drive for longest service life as compared to V-belt drives.
SUMMARY OF THE INVENTION
The Traction Alternator provided with an extended shaft on which a bull gear is shrink fitted. One gear of Auxiliary generator unit, one gear of power take off unit and one idle gear are assembled with the main bull gear of traction alternator and mounted on alternator end shield. These auxiliaries have suitable pinions mount on its shafts which meshes with bull gear and capable to transmit its motion.
The gear case has one opening at back end and four openings on the front face end. At first, a bull gear is shrink fitted on the extended part of the alternator shaft and then back face end of gear case is fixed up with the traction alternator with extended shaft of alternator with bull gear mounted projects through the back face opening in the gear case. Thereafter, one by one auxiliary unit (i.e. 1 no. auxiliary generator, 1 no. exciter, 1 no. power take off unit and 1 no. assembly) idle gear are assembled from the four openings of the front face end of gear case, in such a way that the projected pinions of all auxiliaries mesh with the bull gear. The front face of gear is completely sealed by these auxiliaries with proper sealing arrangement.
In gearcase, the distance between the two end faces and center to centre distance between all the openings of the gear case are maintained within very close tolerance.
To achieve the rated speed of auxiliaries, number of teeth on bull gear to number of teeth of auxiliaries pinions are selected.
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While the traction alternator in running condition, bull gear rotates and transmit the rotary motion to pinions of auxiliaries. During this operation lubrication of gear train is achieved by splash lubrication. At the bottom of gear case, a sump is provided which contain gear oil upto a predermined level and inspected off and on by means of a dip stick. Teeths of the idler gear are partially dipped inside oil and when the gear train operates, this oil is passed on the teeths of bull gear and pinions thus providing on effective lubrication.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
Fig-1- Shows a schematic diagram of prior Art showing arrangement of pulleys and v-Belt.
Fig-2- Shows a schematic diagram showing the gear train of a traction alternator with gear case and oil lubricant therein.
Fig-3- Shows a schematic diagram of engine alternator Assembly.
Fig-4- Shows a schematic diagram of detail assembly of auxiliary Equipment with gear. Train of Fig-2.
Fig-4A- Showing schematic diagram of power of take unit along with PTU pinion.
BRIEF DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION.
As shown in fig-2- The improved gear train arrangement comprises a gear case (1) which contains a main bull gear (2) attached to the shaft of the Traction alternator, coupled with a pinion of power Take off unit (3), and a pinion of auxiliary generator (4) and a pinion of exciter (5) and a gear of idler assembly (6) which constitute the total
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gear assembly of the gear-train. The back face end of the gear case (1) is provided with a single hole, through which the extended shaft of Traction alternator projects and the Back face end is fastened with the body (end shield) of the alternator. Front face end is provided with four holes to insert the four pinions of auxiliaries. These holes are completely sealed by auxiliaries with proper sealing arrangement. The gear case is also provided two side holes, one for pouring lubricant oil through oil filler tube (7) and the other is for dip stick (8) for inspection of oil level. The gear case further provided a sump (9) at the bottom to cat as reservoir of lubricant oil (10). When the main bull gear (2) rotates the power transmission to all pinions (3, 4, 5) and idler gear (6) and also start to rotate simultaneously. Part of idler gear (6) is immersed in lubricant oil (10) and during rotation lubricant oil (10) splashes to the main bull gear (2) and so on to other pinions. The quantity and level of lubricant oil (10) is inspected off and on through a dip stick (8) inserted there in.
Fig-3 shows - The bull gear (2) mounted with the main shaft (12) of alternator (22) and an assembly pinions of exciter (23), Auxiliary generator (24) with the bull gear (2) and arrangement of mounting of alternator (22) with diesel engine (21).
Fig-4- Shows a schematic diagram of detail assembly of auxiliary equipment of fig-(2)-the main bull gear (2) coupled with the pinion (5) of exciter (23) and a gear (6) of idler Assembly (14).
Fig-4 (A)- Showing a sectional view of power take off unit (11) along with its pinion (15).
7 KEY TO FIGURES
Reference Character Feature Figure

1 Gear case 2
2 Bull gear 2
3 Gear of Power take off 2
unit
4 Gear of Auxiliary unit 2
5 Gear of Excita 2
6 GearoflDCER 2
7 Oil filter tube 2
8 DIP STICK 2
9 Sump 2
10 Oil in gear case 2
11 Power take off unit 3
12 Auxiliary Machine 3
13 Alternator End Shield 3
14 IDLER GEAR Assembly 3
15 PTU PINION 4A
16 Pully 1
17 V-belt 1
18 TABEARING 3
19 Main shaft 3
20 Engine mounting Block 3
21 Alco Engine 3
22 Engine auxiliary 3
23 Pinion 3
24 Auxiliary generator 3
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WE CLAIM
1) An improved gear-train arrangement coupled with a bull gear attached to shaft of the traction alternator to transmit power to its auxiliaries comprising
- A gear case (1) containing assembly of plurality of gears pinion (3,4,5,6) coupled
with a main bull gear (2) attached to main shaft of the traction alternator and
- The bull gear is capable enough to transmit power to its auxiliaries through
pinion during rotation and
- The gear case is provided with sump (9) containing lubricant oil and the part of
idler gear is immersed in it which in turn supply the lubricant oil to all the pinions
while in rotation and
- The gear case is further provided oil filler tube hole to pour lubricant oil and a
hole for Dip Stick for measuring oil level.
2) An improved gear-train arrangement coupled with a bull gear attached to shaft of the traction alternator to transmit power to its auxiliaries substantially described there in with reference to accompanying drawings.

The Traction Alternator provided with an extended shaft on which a bull gear is shrink fitted. One gear of Auxiliary generator unit, one gear of power take off unit and one idle gear are assembled with the main bull gear of traction alternator and mounted on alternator end shield. These auxiliaries have suitable pinions mount on its shafts which meshes with bull gear and capable to transmit its motion.
The gear case has one opening at back end and four openings on the front face end. At first, a bull gear is shrink fitted on the extended part of the alternator shaft and then back face end of gear case is fixed up with the traction alternator with extended shaft of alternator with bull gear mounted projects through the back face opening in the gear case. Thereafter, one by one auxiliary unit (i.e. 1 no. auxiliary generator, 1 no. exciter, 1 no. power take off unit and 1 no. assembly) idle gear are assembled from the four openings of the front face end of gear case, in such a way that the projected pinions of all auxiliaries mesh with the bull gear. The front face of gear is completely sealed by these auxiliaries with proper sealing arrangement.
In gearcase, the distance between the two end faces and center to centre distance between all the openings of the gear case are maintained within very close tolerance.
To achieve the rated speed of auxiliaries, number of teeth on bull gear to number of teeth of auxiliaries pinions are selected.
While the traction alternator in running condition, bull gear rotates and transmit the rotary motion to pinions of auxiliaries. During this operation lubrication of gear train is achieved by splash lubrication. At the bottom of gear case, a sump is provided which contain gear oil upto a predermined level and inspected off and on by means of a dip stick. Teeths of the idler gear are partially dipped inside oil and when the gear train operates, this oil is passed on the teeths of bull gear and pinions thus providing on effective lubrication.

Documents:

00911-kol-2006-abstract.pdf

00911-kol-2006-claims.pdf

00911-kol-2006-correspondence others.pdf

00911-kol-2006-description (complete).pdf

00911-kol-2006-drawings.pdf

00911-kol-2006-form1.pdf

00911-kol-2006-form2.pdf

00911-kol-2006-form3.pdf

00911-kol-2006-g.p.a.pdf

911-KOL-2006-ABSTRACT 1.1.pdf

911-KOL-2006-ABSTRACT 1.2.pdf

911-KOL-2006-AMANDED CLAIMS.pdf

911-KOL-2006-AMANDED PAGES OF SPECIFICATION.pdf

911-KOL-2006-AMENDED PAGES.pdf

911-KOL-2006-CANCELLED PAGES 1.1.pdf

911-KOL-2006-CANCELLED PAGES.pdf

911-kol-2006-claims.pdf

911-KOL-2006-CORRESPONDENCE 1.1.pdf

911-kol-2006-correspondence-1.3.pdf

911-KOL-2006-CORRESPONDENCE.pdf

911-KOL-2006-DESCRIPTION (COMPLETE) 1.1.pdf

911-KOL-2006-DESCRIPTION (COMPLETE) 1.2.pdf

911-kol-2006-description (complete)-1.3.pdf

911-KOL-2006-DRAWINGS 1.1.pdf

911-KOL-2006-DRAWINGS 1.2.pdf

911-KOL-2006-DRAWINGS 1.3.pdf

911-kol-2006-examination report.pdf

911-KOL-2006-FORM 1.1.1.pdf

911-KOL-2006-FORM 1.1.2.pdf

911-kol-2006-form 18.pdf

911-KOL-2006-FORM 2 1.3.pdf

911-kol-2006-form 2-1.4.pdf

911-KOL-2006-FORM 2.1.1.pdf

911-KOL-2006-FORM 2.1.2.pdf

911-kol-2006-form 3.pdf

911-KOL-2006-FORM-27-1.pdf

911-kol-2006-form-27.pdf

911-kol-2006-gpa.pdf

911-kol-2006-granted-abstract.pdf

911-kol-2006-granted-claims.pdf

911-kol-2006-granted-description (complete).pdf

911-kol-2006-granted-drawings.pdf

911-kol-2006-granted-form 1.pdf

911-kol-2006-granted-form 2.pdf

911-kol-2006-granted-letter patent.pdf

911-kol-2006-granted-specification.pdf

911-KOL-2006-OTHERS DOCUMENTS.pdf

911-kol-2006-others.pdf

911-kol-2006-reply to examination report-1.1.pdf

911-KOL-2006-REPLY TO EXAMINATION REPORT.pdf

911-kol-2006-specification.pdf

abstract-00911-kol-2006.jpg


Patent Number 244171
Indian Patent Application Number 911/KOL/2006
PG Journal Number 48/2010
Publication Date 26-Nov-2010
Grant Date 22-Nov-2010
Date of Filing 08-Sep-2006
Name of Patentee BHARAT HEAVY ELECTRICALS LIMITED
Applicant Address REGIONAL OPERATIONS DIVISION (ROD),PLOT NO:9/1,DJBLOCK 3rd FLOOR ,KARUNAMOYEE,SALT LAKE CITY ,KOLKATA-700091, having its Registered Office at BHEL HOUSE,SIRI FORT,NEW DELHI-110049,
Inventors:
# Inventor's Name Inventor's Address
1 S.K.Sharma Traction Machine Engineering ,Block-9,Annexe 1st Floor,Bharat Heavy Electricals Limited ,Bhopal-462022
2 A.P.Samal Traction Machine Engineering ,Block-9,Annexe 1st Floor,Bharat Heavy Electricals Limited ,Bhopal-462022
3 Manish Verma Traction Machine Engineering ,Block-9,Annexe 1st Floor,Bharat Heavy Electricals Limited ,Bhopal-462022
4 A.K.Das Traction Machine Engineering ,Block-9,Annexe 1st Floor,Bharat Heavy Electricals Limited ,Bhopal-462022
PCT International Classification Number F16H9/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA