Hydraulic transmission
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 22, 2018
Issued Date -
N/A
app pub date -
Feb 25, 2014
filing date -
Sep 18, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A hydraulic transmission comprising a variable displacement pump and motor, at least one having cylinders having valves which are controllable on each cycle of cylinder working volume to determine the net displacement of working fluid by the cylinder. The transmission has a valve control module which determines a displacement of the pump and the motor by specifying a displacement demand. The pump and/or motor valve control module determine the frequency of intensity peaks in the frequency spectrum of the pattern of cylinders carrying out active and inactive cycles of cylinder working volume using a first procedure and, if these will fall within disallowed frequency bands including the resonant frequency of components with which the transmission is in mechanical communication, the displacement demand, or another input, is periodically modified to suppress generation of those frequencies. The hydraulic transmission is useful for example in a wind turbine generator, or a vehicle.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2014 Application Filing Year
- F04B Class
- 1041 Applications Filed
- 888 Patents Issued To-Date
- 85.31 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 4 Citation Count
- F04B Class
- 45.27 % this patent is cited more than
- 7 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Nov 22, 2025 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Nov 22, 2029 |
