Harsh Vinayak

US Patent:

6918181, Jul 19, 2005

Filed:

Apr 22, 2003

Appl. No.:

10/421621

Inventors:

Harsh Vinayak - Meriden CT, US
Bruce D. Hansen - Shelton CT, US
Edward J. Karedes - Cheshire CT, US
Clark V. Cooper - Glastonbury CT, US
Lawrence M. Zunski - Seymour CT, US

Assignee:

Sikorsky Aircraft Corporation - Stratford CT

International Classification:

B23P015/14

US Classification:

2989335, 29893, 298933, 74462, 451 47

Abstract:

A method for improving acoustic and vibrational properties of gears includes determining the transmission errors of intermeshing gears due to stiffness variations in the gear teeth, performing Gear Tooth Topological (GTT) modifications to compensate for the errors, and isotropically processing the gears to produce an ultra-smooth surface finish. Additional errors from isotropic processing, machining, loading, thermal effects and/or load sharing may be summed with the errors from the stiffness variations and used for the GTT modifications. The teachings of the present invention may reduce noise by as much as 13 to 15 dB.

US Patent:

7100468, Sep 5, 2006

Filed:

Dec 18, 2003

Appl. No.:

10/740375

Inventors:

Yuriy Gmirya - Woodbridge CT, US
Harsh Vinayak - Meriden CT, US
David Andrew Binney - Beacon Falls CT, US
Lawrence Mark Zunski - Seymour CT, US
Vincent F. Millea - Stratford CT, US

Assignee:

Sikorsky Aircraft Corporation - Stratford CT

International Classification:

F16H 57/00

US Classification:

74410, 74423, 74664

Abstract:

A split torque gearbox having multiple input shafts. Each input shaft is connected to two face gears. Each face gear is connected to two quill shafts, one is coaxially mounted and the second is not coaxially mounted. Of the two quill shafts, one is positioned on a first side of an output stage and a second quill shaft is located on a second side of the output stage and the quill shafts are connected thereto. The output stage is connected to a main shaft.

US Patent:

7434764, Oct 14, 2008

Filed:

Dec 2, 2005

Appl. No.:

11/292556

Inventors:

Nicholas D. Lappos - Stratford CT, US
Edward Karedes - Cheshire CT, US
Harsh Vinayak - Meriden CT, US
Yuriy Gmirya - Woodbridge CT, US

Assignee:

Sikorsky Aircraft Corporation - Stratford CT

International Classification:

B64C 27/00
B64C 27/08
F16H 15/38
B64D 35/00

US Classification:

244 1711, 244 1723, 244 23 B, 244 1719, 244 60, 476 40, 476 42

Abstract:

A gearbox of a rotary-wing aircraft includes at least one variable speed system which optimizes the main rotor speed for different flight regimes such as a hover flight profile and a high speed cruise flight profile for any rotary wing aircraft while maintaining an independently variable tail rotor speed.

US Patent:

7651050, Jan 26, 2010

Filed:

Sep 3, 2008

Appl. No.:

12/203358

Inventors:

Nicholas D. Lappos - Stratford CT, US
Edward Karedes - Cheshire CT, US
Harsh Vinayak - Meriden CT, US
Yuriy Gmirya - Woodbridge CT, US

Assignee:

Sikorsky Aircraft Corporation - Stratford CT

International Classification:

B64C 27/04

US Classification:

244 1711, 244 1719, 244 1723, 244 60

Abstract:

A gearbox of a rotary-wing aircraft includes at least one variable speed system which optimizes the main rotor speed for different flight regimes such as a hover flight profile and a high speed cruise flight profile for any rotary wing aircraft while maintaining an independently variable tail rotor speed.

US Patent:

7695573, Apr 13, 2010

Filed:

Sep 9, 2004

Appl. No.:

10/937100

Inventors:

Clark VanTine Cooper - Glastonbury CT, US
Krassimir G. Marchev - Sudbury MA, US
Bill C. Giessen - Cambridge MA, US
Raymond C. Benn - Madison CT, US
Edward H. Bittner - Madison CT, US
Harsh Vinayak - Meriden CT, US

Assignee:

Sikorsky Aircraft Corporation - Stratford CT

International Classification:

C23C 8/24
C23C 8/48
C23C 22/00

US Classification:

148238, 148317

Abstract:

A surface processing method and power transmission component includes transforming a surface region of a metal alloy into a hardened surface region at a temperature that is less than a heat treating temperature of the metal alloy. The metal alloy includes about 11. 1 wt % Ni, about 13. 4 wt % Co, about 3. 0 wt % Cr, about 0. 2 wt % C, and about 1. 2 wt % Mo which reacts with the C to form a metal carbide precipitate of the form MC. The surface processing temperature, vacuum pressure, precursor gas flow and ratio, and time of processing are controlled to provide a desirable hardened surface region having a gradual transition in nitrogen concentration.

US Patent:

20040211278, Oct 28, 2004

Filed:

Apr 23, 2003

Appl. No.:

10/421619

Inventors:

Yuriy Gmirya - Woodbridge CT, US
Harsh Vinayak - Meriden CT, US

International Classification:

F16H055/18

US Classification:

074/410000, 074/409000

Abstract:

A gear adapted to provide load sharing in a torque split transmission module wherein at least one spring element is disposed in combination with a torque driving shaft at one end thereof and in combination with a ring of torque transmitting gear teeth at the other end thereof. The spring element is radially stiff to center the ring of gear teeth about the shaft and is torsionally soft to permit relative rotational displacement between the gear teeth and the shaft. The spring element is substantially disc shaped and includes a plurality of recurved radial spokes. More specifically, the spokes project radially outboard from a first mounting ring, define a 180 degree bend proximal to the gear teeth, and extend inwardly toward a second mounting ring. A pair of spring elements may be used wherein the first mounting ring of each spring element connects to shaft flange and the second mounting ring mounts to an inboard end of a radial flange of the gear teeth. Furthermore, each of the pair of spring elements is disposed on either side of the radial flange to balance the spring force about a medial plane defined by the ring of gear teeth. A manufacturing method for fabricating the spring element is also disclosed.

US Patent:

20050193852, Sep 8, 2005

Filed:

Mar 5, 2004

Appl. No.:

10/795137

Inventors:

Clark Cooper - Glastonbury CT, US
Charles Isabelle - Barkhamsted CT, US
Harsh Vinayak - Meriden CT, US
Jules Kish - Milford CT, US
Robin Miller - Ellington CT, US
Glenn Levasseur - Colchester CT, US
Edward Karedes - Cheshire CT, US
Anthony Chory - Trumbull CT, US
Stephen Sammataro - Madison CT, US
Michael Mullen - Cheshire CT, US
Bruce Hansen - Shelton CT, US
Mark Davis - Vernon CT, US

International Classification:

F16H057/08

US Classification:

074462000

Abstract:

A transmission provides for the application of higher design allowables in bending, pitting, and scoring, as enabled by surface-engineering (SE) processes such as isotropic superfinishing and Me-DLC coating to effect increases in the power density of transmission systems.

US Patent:

20060048857, Mar 9, 2006

Filed:

Sep 9, 2004

Appl. No.:

10/937004

Inventors:

Clark Cooper - Glastonbury CT, US
Raymond Benn - Madison CT, US
Edward Bittner - Madison CT, US
Harsh Vinayak - Meriden CT, US

International Classification:

C23C 8/24

US Classification:

148220000, 148222000, 148230000, 148239000

Abstract:

A surface processing method and power transmission component includes transforming by high current density ion implantation (high intensity plasma ion processing) a surface region of a metal alloy into a hardened surface region at a temperature that is less than a heat treating temperature of the metal alloy. The metal alloy includes between 1.5 wt % and 15 wt % Ni, between 5 wt % and 30 wt % Co, up to 1.0 wt % carbon, and up to 15 wt % of a carbide-forming element, such as molybdenum, chromium, tungsten, vanadium or combinations thereof, that can react with carbon to form metal carbide precipitates of the form MC. The surface processing temperature, vacuum pressure, precursor gas flow and ratio, and time of processing are controlled to provide a desirable hardened surface region having a gradual transition in nitrogen concentration. A vapor deposition process deposits an amorphous hydrogenated carbon coating on the hardened surface region of the metal alloy. An intermediate coating between the coating and the hardened surface region promotes adhesion between the coating and hardened surface region.