Steplessly blockable setting device
AssigneeStabilus GmbH
InventorWinfried Wirges
Life of this patent
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Abstract
A hydropneumatic spring usable as steplessly blockable setting device comprises a by-pass connection in its piston. In this by-pass connection there is arranged a shut-off valve actuatable from the exterior. Furthermore the by-pass connection can be opened by excess pressure in each of the two working chambers. In this way the setting of length of the hydropneumatic spring can be altered by predetermined inward and/or outward thrust forces even when the shut-off valve is closed.
Claims22
Steplessly blockable setting device comprising a cylinder (8) with a cylinder axis, a cavity (13, 14), a cylinder inner surface (8a) and two end walls, a piston rod (9) conducted in sealing manner through at least one (11, 12) of the end walls, which rod is movable in the direction of the cylinder axis in relation to the cylinder (8), a piston unit (10) connected within the cylinder (8) with the piston rod (9), which unit rests in sealing manner on the cylinder inner surface (8a) and divides the cavity (13, 14) within the cylinder (8) into two working chambers (13, 14), a fluid filling in the working chambers (13, 14), a by-pass connection (19c, 19, 20) which connects the two working chambers (13, 14) with one another, and a shut-off valve arrangement (25, 21) actuatable from the exterior of the cylinder (8) in the by-pass connection (19c, 19, 20), wherein the by-pass connection (19c, 19, 20) is openable in response to excess pressure in each of the two working chambers (13, 14), respectively.
Steplessly blockable setting device comprising a cylinder (8) with a cylinder axis, a cavity (13, 14), a cylindrical inner surface (8a) and two end walls, a piston rod (9) conducted in sealing manner through at least one (11, 12) of the end walls, which rod is movable in the direction of the cylinder axis in relation to the cylinder (8), a piston unit (10) connected with the piston rod (9) to form a construction group (9, 10), which unit rests in sealing manner on the cylinder inner surface (8a) and divides the cavity (13, 14) within the cylinder (8) into two working chambers (13, 14), a fluid filling in the working chambers (13, 14), a by-pass connection (19c, 19, 20) which connects the two working chambers (13, 14) with one another, and a shut-off valve arrangement (18, 21), actuatable from the exterior of the cylinder (8), in the by-pass connection (19c, 19, 20), characterised in that a valve chamber (19) with a valve chamber axis and a valve chamber circumferential surface (19b) is provided, in that a valve body (18) is accommodated coaxially with and displaceably in the valve chamber (19), in that this valve body (18) comprises a valve head (25) with an external circumferential surface of larger diameter and a prolongation (26, 27) with an external circumferential surface of smaller diameter, in that radially between the valve body (18) and the valve chamber circumferential surface (19 b) a sealing ring unit (21) is arranged which rests in sealing manner on the valve chamber circumferential surface (19b), in that the valve body (18) is axially biased into a basic position determined by a valve stop (29) in that the sealing ring unit (21) is axially biased into a basic position determined by a sealing stop (29), in that when the valve body (18) and the sealing ring unit (21) are in the basic positions the valve head (25) rests in sealing manner with its external circumferential surface on the sealing ring unit (21), in that the valve body (18) is displaceable out of its basic position into an opening position in which the external circumferential surface of the prolongation (26, 27) has approached the sealing ring unit (21) and in that the sealing ring unit (21) is displaceable out of its basic position into an opening position in which it has approached the external circumferential surface of the prolongation (26, 27).
Dependencies are inferred from the claim text.