Pumps – Processes
Patent
1995-08-28
1996-12-31
Thorpe, Timothy S.
Pumps
Processes
4172221, F04B 126
Patent
active
055888054
ABSTRACT:
An attenuator for a variable displacement hydraulic unit having a servo connected to a swashplate includes an oscillator connected to the servo. The oscillator includes a pipe constituting an inertial portion connected to the servo and a hose defining a hydraulic spring portion connected the other end of the pipe. The pipe has a fixed length and diameter. The pipe and hose combine to attenuate vibration and output pressure in the hydraulic unit by introducing a phase change in the pressure fluctuations within the fluid. A linearized model assists in sizing the components and tuning the oscillator to the troublesome frequency of the hydraulic unit. A method for using the oscillator to attenuate periodic pressure fluctuations due to swashplate vibrations includes fluidly connecting the oscillator to the servo piston bore and introducing a phase change to the periodic component of the fluid pressure by routing the fluid through the oscillator then returning it to the servo piston bore.
REFERENCES:
patent: 3612724 (1971-10-01), Smith
patent: 3826593 (1974-07-01), Von Casimir
patent: 4234292 (1980-11-01), Berg
patent: 4456434 (1984-06-01), El Ibiary
patent: 4734011 (1988-03-01), Hall, Jr.
patent: 5475976 (1995-12-01), Phillips
Korytnyk Peter G.
Sauer Inc.
Thorpe Timothy S.
LandOfFree
Vibration and pressure attenuator for hydraulic units does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vibration and pressure attenuator for hydraulic units, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vibration and pressure attenuator for hydraulic units will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1137809