Abstract: A transmission apparatus for changing the speed of a driven member relative to the speed of a driving member for transmitting effectively continuous torque transfer between the members. The apparatus includes cam gears driven by a driving member, driven gears in continuous engagement with the cam gears, and a driven member which journals the driven gears for rotation. One section of the driving member is hollow and has a plurality of radially extending apertures, each containing a reciprocating detent for engaging an inner cam surface of a corresponding cam gear. A shift member mounts within a bore of the driving member and rotates about the longitudinal axis of the driving member to cause the detents to reciprocate between a cam gear engaged position and a disengaged position.

Abstract: A transmission apparatus for changing the speed of a driven member relative to the speed of a driving member while providing continuous torque to the driven member. The apparatus includes reducing gears driven by a driving member, annular cam gears in continuous engagement with the reducing gears, and a rotatably mounted hollow drum having a plurality of radially extending apertures each containing a detent arranged for reciprocating movement for engaging an inner cam surface of a corresponding cam gear mounted for rotation about an outer drum surface. A cam member mounted within the drum for reciprocal movement along the drum axis has an outer cam surface for respectively reciprocating the detents between a cam gear engaging position and a disengaged position. The inner cam surface of the cam gears have peak sections and valley sections, and axial movement of the cam member to initiate a gear shift is timed relative to the positions of the peak sections and valley sections on adjacent cam gears.

Abstract: A transmission apparatus for changing the speed of a driven member relative to the speed of a driving member without interrupting the torque transfer between the members. The apparatus includes reducing gears driven by a driving member, annular cam gears in continuous engagement with the reducing gears, and a driven member which journals the cam gears for rotation. One section of the driven member is hollow and has a plurality of radially extending apertures each containing a reciprocating detent for engaging an inner cam surface or a corresponding cam gear. A shift member mounts within the bore of the driven member and moves along the rotational axis of the driven member to cause the detents to reciprocate between a cam gear engaged position and a disengaged position.