Externally tuned vibration absorber
First Claim
1. In a hydraulic apparatus of the type having a housing filled with a relatively incompressible fluid, said housing being secured to a prime mover and containing diaphragm means for converting vibratory energy transmitted from the prime mover into pressure waves within the fluid for oscillating a movable element along a linear path of motion, the improvement comprising at least one vibratory absorber unit attached to the outside of the housing for absorbing vibrational energy resulting from the oscillation of the movable element that includes a spring means and an absorber mass affixed to the spring means for reciprocal movement parallel with the path of travel of said movable element, and means to adjust the resonant frequency of the absorber means whereby the resonant frequency of the absorber means can be matched to the frequency range of the pressure waves.
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Accused Products
Abstract
A vibration absorber unit or units are mounted on the exterior housing of a hydraulic drive system of the type that is powered from a pressure wave generated, e.g., by a Stirling engine. The hydraulic drive system employs a piston which is hydraulically driven to oscillate in a direction perpendicular to the axis of the hydraulic drive system. The vibration absorbers each include a spring or other resilient member having one side affixed to the housing and another side to which an absorber mass is affixed. In a preferred embodiment, a pair of vibration absorbers is employed, each absorber being formed of a pair of leaf spring assemblies, between which the absorber mass is suspended.
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Citations
22 Claims
- 1. In a hydraulic apparatus of the type having a housing filled with a relatively incompressible fluid, said housing being secured to a prime mover and containing diaphragm means for converting vibratory energy transmitted from the prime mover into pressure waves within the fluid for oscillating a movable element along a linear path of motion, the improvement comprising at least one vibratory absorber unit attached to the outside of the housing for absorbing vibrational energy resulting from the oscillation of the movable element that includes a spring means and an absorber mass affixed to the spring means for reciprocal movement parallel with the path of travel of said movable element, and means to adjust the resonant frequency of the absorber means whereby the resonant frequency of the absorber means can be matched to the frequency range of the pressure waves.
- 6. In a hydraulic drive apparatus of the type having a housing filled with a relatively incompressible fluid, said housing being secured to a Stirling engine and further including a cylinder for separating the housing into two volumes, a first diaphragm in a volume adjacent the engine and a second diaphragm and an operably associated gas spring in said second volume which coact to convert vibratory energy transmitted from the engine into fluid pressure waves for oscillating a movable element along the axis of said cylinder, the improvement comprising a plurality of external vibratory absorber units spaced about the outside of the housing for absorbing vibrational energy generated by the movable means, said absorber units each including a mass suspended between a pair of resilient spring packages which are secured to the housing to permit the mass to reciprocate along a path of travel that is parallel with the axis of said cylinder.
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16. A hydraulic drive for converting vibratory energy to work that includes
a prime mover for generating vibratory enegy that is attached to a housing filled with a relatively incompressible fluid to form a system, said housing being divided into two volumes by a cylinder movably containing a piston, means to connect the piston to a load,
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17. a first diaphragm located in the housing adjacent to the prime mover in one volume,
a second diaphragm located in the second volume that acts against a first gas spring whereby vibrations transmitted to the housing by the prime mover are converted to pressure waves in the fluid to cause the piston to oscillate in the cylinder along its axis, a vibration absorber mounted upon the housing adjacent the first gas spring that contains an absorber mass slidably contained therein that moves along a path of travel that is parellel to the axis of the cylinder, a spring means acting upon the absorber mass so that the resonant frequency of the absorber is matched to the natural frequency of the system.
Specification