Patents by Inventor Larry Pritchard

Larry Pritchard 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).

  • Publication number: 20150226274
    Abstract: A self-adjusting clutch (10) can include an automatic adjustment mechanism (20) for decreasing an axial dimension within a clutch pack (14). The adjustment can compensate for wear of the facing surfaces of interposed members located within the clutch pack (14), resulting from repeated engaging and disengaging under a clutch apply load within the clutch (10). The adjustment mechanism (20) can include a reaction plate (12) normally biased toward the clutch pack (14) by a plurality of first springs (22). The adjustment mechanism (20) can further include a plurality of pawls (24) supported for rotation by the reaction plate (12) and biased by a plurality of second springs (26) toward a locking position with respect to a ring member (36). The plurality of pawls (24) can lock the reaction plate (12) against axial movement in a direction of the clutch apply load during clutch actuation.
    Type: Application
    Filed: February 5, 2015
    Publication date: August 13, 2015
    Inventor: Larry A. PRITCHARD
  • Publication number: 20150159751
    Abstract: A transfer case (30) and a method of assembly can include a range shifting assembly (60) and a clutch assembly (80) located axially adjacent to one another along a common primary axis. An actuating device (32) can include a concentric gear located coaxially interposed between the range shifting assembly (60) and the clutch assembly (80) for rotation about the common primary axis. The concentric gear (48) can actuate the range shifting assembly (60) during a portion of angular rotation about the common primary axis and can actuate the clutch assembly (80) during a mutually exclusive portion of angular rotation about the common primary axis. The actuating device (32) can include a barrel cam (59), a plurality of springs engageable between the barrel cam (59) and the concentric gear (48), and a shift fork (68) operably engageable with a cam surface groove (57) for guided axial movement to actuate the range shifting assembly (60) between a low-range and high-range drive mode.
    Type: Application
    Filed: December 5, 2014
    Publication date: June 11, 2015
    Inventor: Larry A. PRITCHARD
  • Publication number: 20150158383
    Abstract: A transfer case (21, 330) and a method of assembly can include an input shaft (15) and output shafts (14, 16), a mode clutch (30) for shifting between a two-wheel and four-wheel drive mode, a mode shift mechanism (56, 380, 480), a planetary gear assembly (20) for providing a different drive ratio between the input shaft (15) and the output shaft (14), a range shift mechanism (50, 360, 460), and a synchronizer (40, 340) for speed synchronization before shifting between a low-range drive mode and a high-range drive mode. A fixed ring gear (24) can be connected to the planetary gear assembly (20) during the high-range and low-range drive mode. The mode shift mechanism (56) and the range shift mechanism (50) can be electro-mechanically actuated by a reversible rotatable actuating gear (348, 448) interposed between an expandable clutch actuator (388, 488) and a rotatable barrel cam (359, 459).
    Type: Application
    Filed: February 16, 2015
    Publication date: June 11, 2015
    Applicant: BORGWARNER INC.
    Inventors: Joseph D. MASTIE, Larry A. PRITCHARD, David YOUNG, Donn NIFFENEGGER, Christopher KURMANIAK
  • Patent number: 8925702
    Abstract: The present invention relates to a clutch actuation mechanism having a valve, a plurality of couplings in fluid communication with the valve, wherein one of the plurality of couplings is operable to distribute power between a primary set of wheels and a secondary set of wheels, and another of the plurality of couplings is operable to distribute power between each of the secondary set of wheels. The present invention also includes a drive shaft driven by a source of power, which is also connected to the secondary set of wheels, and a pressure supply device in fluid communication with the valve, wherein the valve directs fluid to the plurality of couplings, and when the valve directs fluid to the one of the plurality of couplings operable to distribute power between the primary set and secondary set of wheels, the drive shaft will transfer power to the secondary set of wheels.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: January 6, 2015
    Assignee: BorgWarner Inc.
    Inventors: Eric C. Sandstrom, Larry A. Pritchard, David Chen
  • Patent number: 8919512
    Abstract: An arrangement of a dual clutch transmission that incorporates a positive pressure lubrication cooler heat exchanger that is integrated into a cover of a wet clutch module of the transmission is provided. Additionally, a method of assembling a wet dual clutch transmission assembly is provided.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: December 30, 2014
    Assignee: BorgWarner Inc.
    Inventor: Larry A. Pritchard
  • Patent number: 8888658
    Abstract: A control system (100) for an all-wheel-drive torque transfer case (102) coupling of a motor vehicle (104) including a power unit (130) having a centrifugally governed fluid pump (132) and a flow valve (134) movable between recirculation and diverter positions (134a, 134b). A control valve (136) located between the fluid pump (132), the all-wheel-drive clutch assembly (112), and the range shift assembly (120). The control valve (136) operable between a first position (136a) allowing fluid flow between the pump (132) and the clutch assembly (112), and a second position (136b) allowing fluid flow between the pump (132) and the range shift assembly (120). At least one range shift valve (138; 152, 154) located between the control valve (136) and the range shift assembly (120).
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: November 18, 2014
    Assignee: BorgWarner, Inc.
    Inventor: Larry A. Pritchard
  • Publication number: 20140205468
    Abstract: A control system (100) for an all-wheel-drive torque transfer case (102) coupling of a motor vehicle (104) including a power unit (130) having a centrifugally governed fluid pump (132) and a flow valve (134) movable between recirculation and diverter positions (134a, 134b). A control valve (136) located between the fluid pump (132), the all-wheel-drive clutch assembly (112), and the range shift assembly (120). The control valve (136) operable between a first position (136a) allowing fluid flow between the pump (132) and the clutch assembly (112), and a second position (136b) allowing fluid flow between the pump (132) and the range shift assembly (120). At least one range shift valve (138; 152, 154) located between the control valve (136) and the range shift assembly (120).
    Type: Application
    Filed: October 31, 2013
    Publication date: July 24, 2014
    Inventor: Larry PRITCHARD
  • Patent number: 8601892
    Abstract: A dual clutch transmission for a vehicle is provided. The transmission includes a first input shaft driven by a first clutch and a second input shaft driven by a second clutch. An output shaft or shafts are driven by the input shafts having selective mesh torsional force transferring gear contact therewith. A differential input gear is driven by the output shaft or shafts. At least one of the input shafts has at least one input gear that torsionally engages with the output shaft via an idler shaft having an idler input shaft torsionally connected on the idler shaft with an idler shaft output gear through a one-way clutch and wherein the idler shaft output gear is meshed with another gear on the one input shaft.
    Type: Grant
    Filed: December 13, 2010
    Date of Patent: December 10, 2013
    Assignee: BorgWarner Inc.
    Inventors: Larry A. Pritchard, Matthew A. Rahaim
  • Patent number: 8490769
    Abstract: A electromagnetic clutch assembly for use in a vehicle is presented. More specifically, the clutch assembly comprises an input member; an output member; a friction clutch pack having a first plurality of clutch plates coupled for rotation with said input member and a second plurality of clutch plates interleaved with said first plurality of clutch plates and coupled for rotation with said output member; a solenoid coil; an actuator hub having an armature plate; and a cam lever assembly having a first end engaging said actuator hub and a second end engaging said friction clutch pack. When electrical current is applied to the solenoid coil, the armature plate moves the actuator hub, the actuator hub engages the cam lever and causes said cam lever to compress the interleaved first and second plurality of clutch plates, thereby, resulting in the coupling of the input and output members.
    Type: Grant
    Filed: March 18, 2010
    Date of Patent: July 23, 2013
    Assignee: BorgWarner Inc.
    Inventors: Larry A. Pritchard, Christopher V. Kurmaniak
  • Patent number: 8342051
    Abstract: A vehicle dual clutch transmission is provided which includes a first clutch housing driven along a first axis extending generally aligned with the output axis of an engine. A second clutch housing is provided which is chain driven from the first clutch housing and extends along a second generally parallel axis. First and second input shafts are respectively driven by the first and second clutches. An output shaft or shafts is provided that is driven by the input shafts and has selective meshed torsional force transferring gear contact therewith. A differential input gear is driven by the output shaft(s).
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: January 1, 2013
    Assignee: BorgWarner Inc.
    Inventors: Larry A. Pritchard, Matthew Rahaim, R. Keith Martin
  • Patent number: 8308598
    Abstract: A controlled differential actuator particularly adapted for differential applications for motor vehicle powertrains. The differential operator incorporates an electromagnetically applied first or primary clutch coupled to a second multi-disc clutch pack through a ball ramp operator. Energization of the solenoid coil selectively applies the main clutch pack which is coupled to a differential carrier and one of the axle half shafts connected with the differential assembly. Modulation of current applied to the solenoid coil allows a selective frictional coupling between the differential axle half shafts which provides desirable traction features for the associated motor vehicle.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: November 13, 2012
    Assignee: Borgwarner, Inc.
    Inventors: Larry A. Pritchard, John Barlage
  • Publication number: 20120247903
    Abstract: An arrangement of a dual clutch transmission that incorporates a positive pressure lubrication cooler heat exchanger that is integrated into a cover of a wet clutch module of the transmission is provided. Additionally, a method of assembling a wet dual clutch transmission assembly is provided.
    Type: Application
    Filed: March 14, 2012
    Publication date: October 4, 2012
    Applicant: BORGWARNER INC.
    Inventor: Larry A. Pritchard
  • Publication number: 20120216638
    Abstract: A transmission and components thereof that consists of three forward speed ratios for an electric vehicle market is brought forth. The transmission has an input shaft for receiving torsional energy from an electric motor. A counter shaft is provided which is powered from the input shaft. A first normally closed clutch is provided for powering the first and third gears. A second normally open clutch is provided for powering the second gear. A synchronizer rotatably is provided for selectively torsionally connecting the first of third gears.
    Type: Application
    Filed: September 8, 2010
    Publication date: August 30, 2012
    Applicant: BORGWARNER INC.
    Inventors: Larry A. Pritchard, Matthew A. Rahaim, Mark R. Buchanan
  • Patent number: 8235198
    Abstract: A hydraulic clutch assembly for a motor vehicle driveline is provided. The clutch assembly comprises an input member, and output member and a friction clutch pack operably disposed therebetween for controlling torque transfer. A first fluid circuit contains hydraulic based fluid at a first pressure and is in fluid communication with the friction clutch pack for lubrication thereof. A second fluid circuit is in fluid communication with the first fluid circuit for replenishing the second fluid circuit with the hydraulic based fluid at a second pressure that is less than the first pressure. The clutch assembly further comprises a motor and a gear train. A first piston is in fluid communication with the second fluid circuit for delivering the hydraulic based fluid thereto A second piston is translated by the hydraulic based fluid displaced by the first piston to actuate the friction clutch pack.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: August 7, 2012
    Assignee: Borgwarner, Inc.
    Inventors: Larry A. Pritchard, Philip J. Francis, Thad Kopp, Tsunlock A. Yu
  • Patent number: 8191698
    Abstract: A hydraulic system having a clutch assembly (30) which is hydraulically actuated, a pressure device (32) in fluid communication with the clutch assembly, and a multi-position actuator device (34) in fluid communication with the pressure device and the clutch assembly. The position of the actuator device includes at least a first position in order for the pressure device to fluidly communicate with the clutch assembly, a second position for maintaining fluid pressure in the clutch assembly, and a third position for bleeding the hydraulic system.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: June 5, 2012
    Assignee: Borgwarner Inc.
    Inventors: Larry Pritchard, Eric Christopher Sandstrom, Philip J. Francis
  • Publication number: 20110167955
    Abstract: A dual clutch transmission for a vehicle is provided. The transmission includes a first input shaft driven by a first clutch and a second input shaft driven by a second clutch. An output shaft or shafts are driven by the input shafts having selective mesh torsional force transferring gear contact therewith. A differential input gear is driven by the output shaft or shafts. At least one of the input shafts has at least one input gear that torsionally engages with the output shaft via an idler shaft having an idler input shaft torsionally connected on the idler shaft with an idler shaft output gear through a one-way clutch and wherein the idler shaft output gear is meshed with another gear on the one input shaft.
    Type: Application
    Filed: December 13, 2010
    Publication date: July 14, 2011
    Applicant: BorgWarner Inc.
    Inventors: Larry A. Pritchard, Matthew A. Rahaim
  • Patent number: 7954318
    Abstract: A hydraulic system having a solenoid bleed valve for bleeding air out of the system is provided. The present invention is a hydraulic system having an actuator, a coupling operably associated with the actuator, and a first solenoid valve operably associated with the actuator and the coupling, where the first solenoid is operable to control pressure applied to the coupling. The present invention also includes a second solenoid valve operably associated with the actuator and the first solenoid, where the second solenoid is operable to relieve pressure.
    Type: Grant
    Filed: July 23, 2008
    Date of Patent: June 7, 2011
    Assignee: BorgWarner Inc.
    Inventor: Larry A. Pritchard
  • Patent number: 7896146
    Abstract: A clutch assembly which incorporates brushless motor technology to engage a clutch pack to cause two shafts to rotate in unison. The clutch actuation assembly includes a clutch apply member, a base plate disposed about an axis, a cam plate disposed about the axis, and at least one cam, operably associated with the base plate and the cam plate. At least one load transferring member operably associated with the at least one cam, as well as an actuator for providing relative rotation between the cam plate and the base plate about the axis, causing the at least one load transferring member to move with respect to the at least one cam, and the cam plate to translate along the axis actuating said clutch apply member.
    Type: Grant
    Filed: December 20, 2007
    Date of Patent: March 1, 2011
    Assignee: BorgWarner, Inc.
    Inventors: Larry A. Pritchard, Christopher J. Kowalsky
  • Publication number: 20100331132
    Abstract: A vehicle dual clutch transmission is provided which includes a first clutch housing driven along a first axis extending generally aligned with the output axis of an engine. A second clutch housing is provided which is chain driven from the first clutch housing and extends along a second generally parallel axis. First and second input shafts are respectively driven by the first and second clutches. An output shaft or shafts is provided that is driven by the input shafts and has selective meshed torsional force transferring gear contact therewith. A differential input gear is driven by the output shaft(s).
    Type: Application
    Filed: June 29, 2010
    Publication date: December 30, 2010
    Applicant: BorgWarner Inc.
    Inventors: Larry A. Pritchard, Matthew Rahaim, R. Keith Martin
  • Publication number: 20100240486
    Abstract: A controlled differential actuator particularly adapted for differential applications for motor vehicle powertrains. The differential operator incorporates an electromagnetically applied first or primary clutch coupled to a second multi-disc clutch pack through a ball ramp operator. Energization of the solenoid coil selectively applies the main clutch pack which is coupled to a differential carrier and one of the axle half shafts connected with the differential assembly. Modulation of current applied to the solenoid coil allows a selective frictional coupling between the differential axle half shafts which provides desirable traction features for the associated motor vehicle.
    Type: Application
    Filed: August 13, 2008
    Publication date: September 23, 2010
    Applicant: BORGWARNER INC.
    Inventors: Larry A. Pritchard, John Barlage