David E Earhart

Author:

David C. Earhart

ISBN #:

0765617765

US Patent:

7798931, Sep 21, 2010

Filed:

Feb 8, 2008

Appl. No.:

12/028447

Inventors:

David Earl Earhart - Brownsburg IN, US

International Classification:

F16H 3/44

US Classification:

475207

Abstract:

A transmission is provided having an input member, an output member, a clutch assembly, two countershaft gearing arrangements, one planetary gear set, a plurality of interconnecting members, and a plurality of torque transmitting devices. Each of the countershaft gearing arrangements includes a plurality of co-planar gear sets. The torque transmitting devices include a combination of clutches, brakes, and synchronizers.

US Patent:

7837589, Nov 23, 2010

Filed:

Feb 8, 2008

Appl. No.:

12/028444

Inventors:

David Earl Earhart - Brownsburg IN, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

F16H 3/44

US Classification:

475302, 475218, 475303, 475317, 475329

Abstract:

A transmission is provided having an input member, an output member, a split dual clutch assembly, two countershaft gearing arrangements, one planetary gear set, a plurality of interconnecting members, and a plurality of torque transmitting devices. Each of the countershaft gearing arrangements includes a plurality of co-planar gear sets. The torque transmitting devices include a combination of clutches, brakes, and synchronizers.

US Patent:

7846055, Dec 7, 2010

Filed:

Feb 8, 2008

Appl. No.:

12/028438

Inventors:

David Earl Earhart - Brownsburg IN, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

F16H 37/04

US Classification:

475207, 475218

Abstract:

A transmission is provided having an input member, an output member, a split dual clutch assembly, two countershaft gearing arrangements, one planetary gear set, a plurality of interconnecting members, and a plurality of torque transmitting devices. Each of the countershaft gearing arrangements includes a plurality of co-planar gear sets. The torque transmitting devices include a combination of clutches, brakes, and synchronizers.

US Patent:

7896770, Mar 1, 2011

Filed:

Aug 1, 2007

Appl. No.:

11/832490

Inventors:

David Earl Earhart - Brownsburg IN, US
James A. Raszkowski - Indianapolis IN, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

F16H 37/02

US Classification:

475218, 475209, 74329, 74331, 74340

Abstract:

A transmission is provided having an input member, an output member, a dual clutch assembly, two countershaft gearing arrangements, one planetary gear set, a plurality of interconnecting members, and a plurality of torque transmitting devices. Each of the countershaft gearing arrangements includes a plurality of co-planar gear sets. The torque transmitting devices include a combination of clutches, brakes, and synchronizers.

US Patent:

8038564, Oct 18, 2011

Filed:

Jan 18, 2011

Appl. No.:

13/008654

Inventors:

David Earl Earhart - Brownsburg IN, US
James A. Raszkowski - Indianapolis IN, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

F16H 37/02

US Classification:

475218, 475207, 475302, 74330, 74331, 74340

Abstract:

A transmission is provided having an input member, an output member, a dual clutch assembly, two countershaft gearing arrangements, one planetary gear set, a plurality of interconnecting members, and a plurality of torque transmitting devices. Each of the countershaft gearing arrangements includes a plurality of co-planar gear sets. The torque transmitting devices include a combination of clutches, brakes, and synchronizers.

US Patent:

8128377, Mar 6, 2012

Filed:

Apr 3, 2007

Appl. No.:

11/695890

Inventors:

David E. Earhart - Brownsburg IN, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

F04B 49/00

US Classification:

417216, 417 2, 417287

Abstract:

A split-pressure, dual-pump system for supplying hydraulic fluid to a multi-speed transmission is provided. The system includes a low-pressure work circuit operatively connected to a fixed displacement pump, and a high-pressure work circuit operatively connected to a variable displacement pump. The system also includes a regulator valve fluidly coupled to the variable displacement pump via a decrease circuit and an overage circuit for regulating the flow of fluid to the high-pressure work circuit. The invention consists of separating the high-pressure needs of the system into a separate work circuit from the low-pressure needs of the system, and optimizing pump design separately for each work circuit to maximize transmission efficiency and reduce parasitic losses. A method of supplying hydraulic fluid to a multi-speed transmission at variable flow and pressure is also provided.

US Patent:

20080182700, Jul 31, 2008

Filed:

Jan 25, 2007

Appl. No.:

11/626872

Inventors:

DAVID EARL EARHART - Brownsburg IN, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

F16H 37/02

US Classification:

475207

Abstract:

A transmission is provided that combines first and second shaft members in a countershaft configuration with a planetary gear set and first and second head gear sets to provide ratios. Each of the shaft members includes gears in no more than four co-planar, intermeshing gear sets (and in some embodiments no more than three co-planar, intermeshing gear sets) and two sets of radially nested clutches, thus minimizing the overall length of the shaft members. At least one gear concentric with each shaft member is supported by a bearing on the adjacent gear rather than on the shaft member, thereby minimizing the weight of each shaft member. The transmission provides at least seven forward speed ratios and a reverse speed ratio and utilizes at most eight torque-transmitting mechanisms. A method of reducing the length and weight of a transmission package is also provided.

US Patent:

20120122624, May 17, 2012

Filed:

Sep 9, 2011

Appl. No.:

13/228632

Inventors:

Brian Schoolcraft - Crawfordsville IN, US
James A. Raszkowski - Indianapolis IN, US
David E. Earhart - Brownsburg IN, US
Gary Reichanadter - Mooresville IN, US

International Classification:

F16H 37/06
F16H 37/02

US Classification:

475219, 475207

Abstract:

The present invention provides an infinitely variable transmission for a powered vehicle which includes a power source. The transmission includes an input shaft and an output shaft, the output shaft being spaced from the input shaft. The transmission further includes a variator coupled between the input shaft and output shaft. In addition, at least two planetary gearsets are disposed adjacent to the variator and an input coupler is configured to selectively couple the variator to the power source.