Piston end dampening

Details Piston end dampening Piston end dampening

1999-01-22

2000-04-11

Lopez, F. Daniel

Motors: expansible chamber type

Working member position responsive motive fluid control

Working member carries part within working chamber which...

91396, 91405, 92164, F15B 1522

Patent

active

060476273

ABSTRACT:
A pressure medium driven device has a cylinder having a cylinder tube, means forming a discharge outlet for a pressure medium, a piston movable in the cylinder over a stroke having a stroke end which is dampened by a counter pressure generated by throttling the pressure medium within a dampening area prior to its dissipation into the discharge outlet, a piston ring held between the piston end the cylinder in the dampening area and used as a throttle, a dampening sleeve provided in the cylinder for guiding the piston into an end position, the piston ring extending under the action of internal tension beyond a piston diameter and expanding to a maximum internal diameter of a cone, the dampening sleeve having an internal cone causing a progressive dampening, the piston ring having a slit with a minimal width in the cylinder tube, the dampening sleeve being provided in the dampening area with radial boreholes which duct the pressure medium into longitudinal slots from which it reaches the discharge outlet.

REFERENCES:
patent: 4048905 (1977-09-01), Souslin
patent: 4207800 (1980-06-01), Homuth
patent: 4425836 (1984-01-01), Pickrell
Publication No. 693765: Hydraulikzylinder Mit Endlagendaempfung.

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