FLUID BRAKE DEVICE AND VARIABLE VALVE TIMING APPARATUS

A fluid brake device has a brake shaft which penetrates a case. The case provides a fluid chamber for a magneto-rheological fluid. A magnetic seal has a magnetic seal sleeve which holds a small amount of the magneto-rheological fluid by magnetic flux. In addition to the magnetic seal, an axially pum...

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Bibliographic Details
Main Authors YAMADA JUN, WASHINO SEIICHIROU, SASAKI TAKETSUGU, OTSUBO MAKOTO, OE SHUHEI, OKA KUNIAKI
Format Patent
LanguageEnglish
Published 24.01.2013
Subjects
BLASTING
BRAKES
CLUTCHES
COUPLINGS FOR TRANSMITTING ROTATION
CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
CYLINDERS
ENGINE PLANTS IN GENERAL
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
LIGHTING
MACHINES OR ENGINES IN GENERAL
MEANS FOR DAMPING VIBRATION
MECHANICAL ENGINEERING
PISTONS
SEALINGS
SHOCK-ABSORBERS
SPRINGS
STEAM ENGINES
THERMAL INSULATION IN GENERAL
WEAPONS
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Summary:A fluid brake device has a brake shaft which penetrates a case. The case provides a fluid chamber for a magneto-rheological fluid. A magnetic seal has a magnetic seal sleeve which holds a small amount of the magneto-rheological fluid by magnetic flux. In addition to the magnetic seal, an axially pumping element is provided on an axial outside of the magnetic seal. The axially pumping element is provided by a shaft helical groove formed on an opposing wall of the brake shaft and/or a case helical groove formed on a surrounding wall. As the brake shaft rotates, the helical groove pushes the magneto-rheological fluid back to the magnetic seal. A combination of the magnetic seal and the axially pumping element may reduce leakage of the magneto-rheological fluid.
Bibliography:Application Number: US201213553085