Patents by Inventor Robert J. Holan

Robert J. Holan 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).

  • Asymmetrical differential drive
    Patent number: 5070745
    Abstract: A differential for motor vehicles uses a pinion gear attached to a drive shaft to drive a single ring gear attached to a first axle half shaft positioned at right angles to the drive shaft. The axle half shaft is simultaneously fastened to, and coaxially aligned with, the ring gear by means of a disc-shaped centering hub having external splines which simultaneously mesh with adjacent, internally splined cylindrical inner surfaces of the ring gear and a disc-shaped backing plate. Internal splines projecting inward from the inner cylindrical surface of a central coaxial hole through the centering hub mesh with external splines on the cylindrical surface of the axle half shaft.In one embodiment, a second opposing axle half shaft is allowed to free-wheel within the differential case. In a second embodiment, the opposing axle half shaft is slippably driven by the first axle half shaft by means of a clutch coupling the first and second axle half shafts.
    Type: Grant
    Filed: December 24, 1990
    Date of Patent: December 10, 1991
    Inventors: Kelly D. Lindsey, Robert J. Holan
  • Single gear-pair vehicle differential
    Patent number: 4815338
    Abstract: A differential for motor vehicles uses a crown or ring gear attached to a drive shaft to drive a single pinion gear attached to a first axle half shaft positioned at right angles to the drive shaft. In one embodiment, a second opposing axle half shaft is allowed to free wheel within the differential case. In a second embodiment, the opposing axle half shaft is slippably driven by the first axle half shaft by means of a clutch coupling the first and second axle half shafts.In a third embodiment, first and second axle half shafts are rigidly coupled to one another.
    Type: Grant
    Filed: January 16, 1987
    Date of Patent: March 28, 1989
    Inventors: Robert J. Holan, Kelly D. Lindsey
  • Single gear-pair vehicle differential
    Patent number: 4637276
    Abstract: A differential for motor vehicles uses a crown or ring gear attached to a drive shaft to drive a single pinion gear attached to a first axle half shaft positioned at right angles to the drive shaft. In one embodiment, a second opposing axle half shaft is allowed to free wheel within the differential case. In a second embodiment, the opposing axle half shaft is slippably driven by the first axle half shaft by means of a clutch coupling the first and second axle half shafts.In a third embodiment, first and second axle half shafts are rigidly coupled to one another.
    Type: Grant
    Filed: November 23, 1984
    Date of Patent: January 20, 1987
    Inventors: Robert J. Holan, Kelly D. Lindsey