Torsional vibration damping means for marine propulsion device
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsAkihiko Hoshiba, Hiroaki Fujimoto
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Abstract
An outboard drive having an improved arrangement for absorbing torsional vibrations and isolating the drive shaft from them. Several embodiments of torsional vibration dampers are disclosed each of which includes a first member that is detachably connected to the drive shaft and an inertial member that is coupled to the first member. In some embodiments, this coupling is achieved by an elastomeric sleeve and in others it is achieved by means of a viscous fluid.
Claims11
In a marine outboard drive comprising a power head containing an internal combustion engine having an output shaft, a flywheel drive from one end of said output shaft, a drive shaft housing depending from said power head and journaling a drive shaft driven by the other end of said output shaft, a lower unit containing propulsion means for propelling an associated watercraft and means for driving said propulsion means from said drive shaft, the improvement comprising torsional vibration damping means directly connected to said drive shaft for reducing the effects of torsional vibrations on said drive shaft, said torsional vibration damping means comprising a first annular member detachably affixed for rotation with said drive shaft, an annular inertial member axially aligned with said first annular member and rotatably relative to said drive shaft, and means for coupling said inertial member to said first member for relative movement therebetween.
In a marine outboard drive comprising a drive shaft housing journaling a drive shaft driven by a power source, a lower unit containing propulsion means for propelling an associated watercraft and means for driving said propulsion means from said drive shaft, the improvement comprising torsional vibration damping means directly connected to said drive shaft for reducing the effects of torsional vibrations on said drive shaft, said torsional vibration damping means comprising a first member detachably affixed to said drive shaft, an inertial member, and means for coupling said inertial member to said first member for relative movement therebetween, said inertial member being immersed in a body of water and having vanes for cooperating with the water for dissipating heat and for increasing its effective inertia.
Dependencies are inferred from the claim text.