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BALANCED-FREE PISTON ENGINE

  • US 3,610,217 A
  • Filed: 10/21/1969
  • Issued: 10/05/1971
  • Est. Priority Date: 10/21/1969
  • Status: Expired due to Term
First Claim
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1. An unsymmetrical, synchronized, balanced, free piston engine adapted to drive a reciprocally movable member of an energy absorbing device comprising, in combination:

  • an engine housing;

    means for defining a first power cylinder in the engine housing;

    means for defining a second power cylinder in the engine housing, with the second power cylinder being substantially coaxial to the first power cylinder;

    main piston means including a first power piston mounted in the first power cYlinder for reciprocal movement therein along an axis substantially parallel to the central longitudinal axis of the first power cylinder, the first power piston defining a first combustion chamber with the first power cylinder, and including a second power piston mounted in the second power cylinder for reciprocal movement therein along an axis substantially parallel to the central longitudinal axis of the second power cylinder, the second power piston defining a second combustion chamber with the second power cylinder, the second combustion chamber being arranged to be alternately acting with the first combustion chamber;

    connection means, including shaft means, for connecting the main piston means, including the first power piston and the second power piston, to the movable member of an energy absorbing device, the main piston means, the connecting means, and the movable member of the energy absorbing device defining a power assembly wherein all components of the power assembly always move together as a unit;

    a synchronizerbalancer assembly having first means connected to move with the power assembly and having a counterbalancing means arranged for translational movement as a unit with respect to the engine housing in a direction opposite to the direction of movement of the power assembly in response to movement of the first means, the counterbalancing means having a preselected weight such that the absolute product of the weight associated to move with the counterbalancing means of the synchronizer-balancer assembly multiplied by the stroke of the counterbalancing means of the synchronizer-balancer assembly is substantially equal to the absolute product of the sum of the weight associated to move with the power assembly multiplied by the corresponding stroke length of the power assembly.

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