Patents Assigned to Tractech Inc.
  • Patent number: 7311632
    Abstract: A gearless locking differential includes clutch housings containing V-shaped slots that cooperate with a cross pin to disconnect from the differential drive shaft an overrunning driven shaft, characterized in that the wall surfaces that define the V-slots extend parallel with the axis of rotation of the differential housing, and the cross pin has tapered convergent end portions. The frictions packs that releasably connect the side gears to the clutch members include annular friction plates that are arranged between pairs of reaction plates and include polygonal internal surfaces that slidably and non-rotatably engage a corresponding polygonal circumferential surface on the associated side gear. The locking lug and locking slot that cooperate to provided limited angular relative displacement between the clutch housings each have parallel side walls. As a consequence of the invention, the machining and finishing of the components of the differential are achieved in a simplified cost-effective manner.
    Type: Grant
    Filed: July 26, 2005
    Date of Patent: December 25, 2007
    Assignee: Tractech Inc.
    Inventors: Walter L. Dissett, Jeffrey P. Lane
  • Patent number: 6826981
    Abstract: A differential for racing cars that travel in a given direction around a closed circular or oval track, including an overrunning clutch arrangement for disengaging from the drive train of the differential an outside wheel shaft that overruns the inside wheel shaft during a turn by a given amount, and a locking device for continuously locking the inside wheel shaft to the differential drive train. Preferably, the locking device comprises a locking gear that is non-rotatably splined to the inside wheel shaft and that has pinion teeth that are in continuous engagement with the central drive member of the differential.
    Type: Grant
    Filed: August 14, 2003
    Date of Patent: December 7, 2004
    Assignee: Tractech Inc.
    Inventor: Robert A. Kress
  • Patent number: 6688194
    Abstract: A locking differential includes a pair of annular coaxially-arranged axially-spaced clutch members having adjacent faces that contain cam groove that receive a driving cross pin, cooperating locking lugs and grooves being provided on the adjacent faces of the clutch members for preventing relative rotation therebetween. The cross pin extends diametrically across a supporting sleeve that is non-rotatably mounted concentrically within the central chamber of the cylindrical housing of the differential, thereby permitting the differential to be retrofit into various differential casings.
    Type: Grant
    Filed: October 4, 2001
    Date of Patent: February 10, 2004
    Assignee: Tractech Inc.
    Inventors: Walter L. Dissett, Paul J. Valente
  • Publication number: 20030066386
    Abstract: A locking differential includes a pair of annular coaxially-arranged axially-spaced clutch members having adjacent faces that contain cam groove that receive a driving cross pin, cooperating locking lugs and grooves being provided on the adjacent faces of the clutch members for preventing relative rotation therebetween. The cross pin extends diametrically across a supporting sleeve that is non-rotatably mounted concentrically within the central chamber of the cylindrical housing of the differential, thereby permitting the differential to be retrofit into various differential casings.
    Type: Application
    Filed: October 4, 2001
    Publication date: April 10, 2003
    Applicant: Tractech Inc.
    Inventors: Walter L. Dissett, Paul J. Valente
  • Patent number: 6374701
    Abstract: A locking differential includes a pair of opposed collinearly arranged annular clutch members the adjacent faces of which contain corresponding pairs of V-shaped drive grooves for receiving a cylindrical drive pin that is connected with the differential casing, the planar faces of the drive grooves being arranged at an obtuse angle of about 120°. Preferably, in order to obtain line-to-line contact with the drive pin, each of the four planar drive faces of a clutch member has an angle of convergence of about 3.017° relative to the diametrically arranged lines of juncture of the associated pairs of planar drive faces. The clutch members are normally biased apart by helical springs the end portions of which are received in pockets contained in the opposed faces of the clutch members, respectively.
    Type: Grant
    Filed: October 22, 1999
    Date of Patent: April 23, 2002
    Assignee: Tractech Inc.
    Inventor: Wendel W. Tittjung
  • Patent number: 6209700
    Abstract: An improved electric clutch for driving refrigeration compressors and the like includes an annular ferromagnetic annular armature that is connected with a drive shaft via the outer peripheral portion of an annular resilient disk the inner peripheral portion of which is connected with a rotor that in turn is connected with the drive shaft. The armature is normally biased in the direction of the rotor toward an inactive de-energized position in spaced relation relative to an annular driven member that is connected with the driven shaft. A stationary electromagnetic coil is mounted on the opposite side of the driven member from the armature, so that when the coil is energized, the armature is attracted toward an active energized position in frictional engagement with the driven member, thereby to cause the driven shaft to be driven by the drive shaft.
    Type: Grant
    Filed: September 27, 1999
    Date of Patent: April 3, 2001
    Assignee: Tractech Inc.
    Inventors: Jason L. Wogaman, Rodger L. Marx
  • Patent number: 6076429
    Abstract: A differential mechanism of the holdout ring type is characterized by improved annular clutch plates with trapezoidally configured cam teeth for mating with the center cam teeth of the center cam. Each clutch plate has inner cam and outer clutch teeth extending from a planar surface thereof with a gap between the inner and outer teeth receiving a holdout ring. The inner cam teeth have a base wider than the top portion thereof so that there is surface to surface contact with the center cam teeth. This reduces torque in the clutch cam teeth and provides smoother operation and a longer service life to the differential.
    Type: Grant
    Filed: March 4, 1999
    Date of Patent: June 20, 2000
    Assignee: Tractech Inc.
    Inventor: Paul J. Valente
  • Patent number: 5885181
    Abstract: A helical gear differential includes lubrication passages for circulating lubricating oil to the helical pinion counter bores and the side gear counter bores, thereby to increase the operating life of, and to reduce the operating noise level of, the differential. Openings contained in one of the housing and cover sections introduces lubricating oil into the ends of the associated pinion bores to lubricate the ends of the adjacent pinions, and the oil flows through the housing openings to lubricate the remote ends of the pinions. The adjacent ends of the other pinions are lubricated via second housing openings contained in the walls of housing relieved portions. An improved retaining means including a plate and a split snap ring serve to retain the cross pin spacer member within a transverse bore contained in the housing body section.
    Type: Grant
    Filed: July 29, 1997
    Date of Patent: March 23, 1999
    Assignee: Tractech Inc.
    Inventor: Walter L. Dissett
  • Patent number: 5836220
    Abstract: A locking differential including a pair of clutch members, a pair of associated annular side gears, a drive rod extending between the clutch members, and a pair of spacers arranged between the side gears and drive rod is characterized by a locking pin, disc, E-clip, spring assembly which urges the clutch members outwardly apart toward engaged positions with the side gears. The face of each clutch member contains at least one pin bore for receiving a locking pin and at least one oversized spring bore for receiving a spring. The outer periphery of each clutch member contains a pin access opening communicating with each pin bore. During assembly, a tool can be inserted into the pin access opening to displace the locking pin contained therein, whereby the E-clip may he installed on a locking pin circumferential groove and the associated spring is maintained in compression, thereby to urge the clutch members axially outwardly apart.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: November 17, 1998
    Assignee: Tractech Inc.
    Inventor: Paul J. Valente
  • Patent number: 5715733
    Abstract: A locking differential includes a plurality of spring biasing assemblies each consisting solely of a helical spring having a spring cap member mounted on one end thereof for isolating the spring from the associated locking pin that extends at one end within the oversized spring bore. The spring cap member has a disc portion the outer diameter of which is at least as great as the outer diameter of the helical spring, and a central plug portion that extends within the spring, whereby the spring bears at one end solely against the cap disc portion and is isolated thereby from the locking pin. The diameter of the cap disc portion is also less than the width of a radially extending access opening that communicates with the oversized spring bore contained in a clutch member, thereby to permit introduction of the spring with the cap mounted thereon into the spring bore via the spring access opening.
    Type: Grant
    Filed: November 25, 1996
    Date of Patent: February 10, 1998
    Assignee: Tractech Inc.
    Inventor: Walter L. Dissett
  • Patent number: 5671640
    Abstract: An automatic locking differential of the type having C-clip retainers adapted for mounting in peripheral grooves contained in the adjacent ends of the output shafts includes an annular center driver gear, a center cam member arranged concentrically within the center driver gear, and at least one resilient preload member for biasing a pair of side gears into engagement with an internal annular shoulder on the center cam member, thereby to dampen the rotational play between the center cam and the center driver member. A pair of preload resilient members may be provided at the remote ends of the side gears for axially biasing the side gears together toward engagement with the internal diameter on the center cam member.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: September 30, 1997
    Assignee: Tractech Inc.
    Inventor: Paul J. Valente