Patents by Inventor Craig S. Ross
Craig S. Ross has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8474341Abstract: A transmission includes an input member, an output member, first and second shafts, first and second countershafts, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: August 10, 2011Date of Patent: July 2, 2013Assignee: GM Global Technology Operations LLCInventors: Edward W. Mellet, Scott H. Wittkopp, Craig S. Ross
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Patent number: 8464599Abstract: A transmission is connectable to an input member and includes an output transfer gear, first and second shaft members, first and second countershaft members, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of gears, synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: January 10, 2011Date of Patent: June 18, 2013Assignee: GM Global Technology Operations LLCInventors: Craig S. Ross, Edward W. Mellet, Scott H. Wittkopp
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Patent number: 8438941Abstract: A transmission is connectable to an input member and includes an output transfer gear, first and second shaft members, first and second countershaft members, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of gears, synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: April 14, 2011Date of Patent: May 14, 2013Assignee: GM Global Technology Operations LLCInventors: Edward W. Mellet, Scott H. Wittkopp, Craig S. Ross
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Patent number: 8434380Abstract: A transmission includes an input member, an output transfer gear, first and second shaft members, a countershaft, a reverse shaft member, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output gear.Type: GrantFiled: November 10, 2009Date of Patent: May 7, 2013Assignee: GM Global Technology Operations LLCInventor: Craig S. Ross
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Patent number: 8424404Abstract: An eight forward speed dual clutch transmission includes a pair of input clutches which selectively provide drive torque to a pair of concentric input shafts. Gears coupled to and driven by the input shafts are in constant mesh with gears freely rotatably disposed on a pair of parallel countershafts or layshafts. A plurality of synchronizer clutches selectively synchronize and connect the various gears to the countershafts or layshafts to provide a desired gear ratio in the proper sequence. Reverse gear is similarly provided through a three gear gear train. Upon the synchronization and engagement of a particular gear, the associated input clutch is activated or engaged to supply drive torque to the input shaft, through the synchronized and engaged gear pair and out the countershaft or layshaft. An additional gear on each countershaft or layshaft engages a common gear that directly drives a differential which, in turn, drives a pair of drive axles.Type: GrantFiled: January 10, 2011Date of Patent: April 23, 2013Assignee: GM Global Technology Operations LLCInventors: Craig S. Ross, Edward W. Mellet, Scott H. Wittkopp
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Patent number: 8375817Abstract: A transmission is connectable to an input member and has an output member, first and second shafts, first and second countershafts, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: March 12, 2010Date of Patent: February 19, 2013Assignee: GM Global Technology Operations LLCInventors: Craig S. Ross, Scott H. Wittkopp, Edward W. Mellet
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Patent number: 8336411Abstract: A transmission includes an input member, an output transfer gear, first and second shaft or transmission input members, first and second counter shaft members, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: February 12, 2010Date of Patent: December 25, 2012Assignee: GM Global Technology Operations LLCInventors: Craig S. Ross, Elizabeth I. Wooden, Scott H. Wittkopp
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Patent number: 8336410Abstract: A transmission includes an input member, an output transfer gear, first and second shaft members, first and second counter shaft members, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: February 12, 2010Date of Patent: December 25, 2012Assignee: GM Global Technology Operations LLCInventors: Craig S. Ross, Edwin T. Grochowski, Scott H. Wittkopp
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Patent number: 8327730Abstract: A transmission includes an input member, an output member, first and second shafts, first and second countershafts, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: March 5, 2010Date of Patent: December 11, 2012Assignee: GM Global Technology Operations LLCInventors: Edward W. Mellet, Scott H. Wittkopp, Craig S. Ross
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Patent number: 8302500Abstract: A transmission includes an input member, an output member, first and second shafts, first and second countershafts, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: March 29, 2010Date of Patent: November 6, 2012Assignee: GM Global Technology Operations LLCInventors: Craig S. Ross, Scott H. Wittkopp, Edward W. Mellet
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Publication number: 20120272760Abstract: A transmission includes a transmission housing, a dual clutch assembly, a first through seven gear sets, a first transmission input shaft member rotatably supported in the transmission housing, a second transmission input shaft member rotatably supported in the transmission housing, a first countershaft rotatably supported within the transmission housing and spaced apart from and parallel with the first and second transmission input shaft members, a second countershaft rotatably supported within the transmission housing and spaced apart from and parallel with the first and second transmission input shaft members and five synchronizer assemblies each for selectively coupling at least one of the gears of the gear sets with at least one of the first countershaft and the second countershaft. The dual clutch assembly and the synchronizer assemblies are operable to achieve at least eight forward speed ratios and a reverse speed ratio between an input member and output member.Type: ApplicationFiled: April 27, 2011Publication date: November 1, 2012Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Edward W. Mellet, Craig S. Ross, Scott H. Wittkopp
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Publication number: 20120272761Abstract: A transmission includes an input member, an output member, first and second transmission input shafts, first and second countershafts, a plurality of co-planar gear sets and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and eight forward speed ratios between the input member and the output member.Type: ApplicationFiled: April 27, 2011Publication date: November 1, 2012Applicant: GM Global Technology Operations LLCInventors: Edward W. Mellet, Scott H. Wittkopp, Craig S. Ross
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Patent number: 8297140Abstract: A transmission connectable to an input member and has an output member, first and second shafts, first and second countershafts, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: March 12, 2010Date of Patent: October 30, 2012Assignee: GM Global Technology Operations LLCInventors: Craig S. Ross, Scott H. Wittkopp, Edward W. Mellet
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Publication number: 20120260756Abstract: A transmission is connectable to an input member and includes an output transfer gear, first and second shaft members, first and second countershaft members, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of gears, synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: ApplicationFiled: April 14, 2011Publication date: October 18, 2012Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Edward W. Mellet, Scott H. Wittkopp, Craig S. Ross
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Patent number: 8286522Abstract: A transmission includes an input member, an output member, first and second shafts, a countershaft, a reverse shaft, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: March 3, 2010Date of Patent: October 16, 2012Assignee: GM Global Technology Operations LLCInventors: Edward W. Mellet, Craig S. Ross, Scott H. Wittkopp
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Patent number: 8240224Abstract: A transmission is connectable to an input member and includes an output member, first and second shafts, first and second countershafts, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: March 10, 2010Date of Patent: August 14, 2012Assignee: GM Global Technology Operations LLCInventors: Edward W. Mellet, Craig S. Ross, Scott H. Wittkopp
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Patent number: 8220351Abstract: A transmission includes an input member, an output transfer gear, first and second shaft members, a countershaft, a reverse shaft, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: February 16, 2010Date of Patent: July 17, 2012Assignee: GM Global Technology Operations LLCInventors: Craig S. Ross, Edwin T. Grochowski, Scott H. Wittkopp
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Patent number: 8220352Abstract: A transmission includes an input member, an output member, first and second shafts, first and second countershafts, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: GrantFiled: March 16, 2010Date of Patent: July 17, 2012Assignee: GM Global Technology Operations LLCInventors: Craig S. Ross, Scott H. Wittkopp, Edward W. Mellet
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Publication number: 20120174706Abstract: A transmission is connectable to an input member and includes an output transfer gear, first and second shaft members, first and second countershaft members, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of gears, synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and a plurality of forward speed ratios between the input member and the output member.Type: ApplicationFiled: January 10, 2011Publication date: July 12, 2012Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Craig S. Ross, Edward W. Mellet, Scott H. Wittkopp
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Publication number: 20120174703Abstract: An eight forward speed dual clutch transmission includes a pair of input clutches which selectively provide drive torque to a pair of concentric input shafts. Gears coupled to and driven by the input shafts are in constant mesh with gears freely rotatably disposed on a pair of parallel countershafts or layshafts. A plurality of synchronizer clutches selectively synchronize and connect the various gears to the countershafts or layshafts to provide a desired gear ratio in the proper sequence. Reverse gear is similarly provided through a three gear gear train. Upon the synchronization and engagement of a particular gear, the associated input clutch is activated or engaged to supply drive torque to the input shaft, through the synchronized and engaged gear pair and out the countershaft or layshaft. An additional gear on each countershaft or layshaft engages a common gear that directly drives a differential which, in turn, drives a pair of drive axles.Type: ApplicationFiled: January 10, 2011Publication date: July 12, 2012Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Craig S. Ross, Edward W. Mellet, Scott H. Wittkopp