Hydraulic tension stop for vibration dampers
AssigneeZF Sachs AG
InventorSteffen Obst
Life of this patent
Estimating the term…
Abstract
Hydraulic tension stop for vibration dampers, shock absorbers, or similar piston-cylinder assemblies, where each assembly has a fluid-filled working space, the boundaries of which are formed axially by a piston rod guide and the piston and radially by the cylinder and the piston rod which carries the piston, part of this working space also belonging to the tension stop. A stop ring is mounted on the piston rod, which ring cooperates with a slotted, outwardly tensioned damping ring, so that the tension damping can be varied as a function of the stroke. When the stop ring reaches a predetermined position, the damping ring seats in a rest-position channel in a slide face permanently attached to the cylinder, the channel having a conical surface.
Claims20
A hydraulic tension stop for a vibration damper of the type comprising a cylinder, a piston rod carrying a piston, a piston rod guide, and a liquid-filled working space which is bounded axially by the piston rod guide and the piston, and radially by the cylinder and the piston rod, said tension stop comprising
- a slide face which is permanently fixable to the cylinder in said working space,
- a circumferential rest-position channel in said slide face, said channel having a conical surface,
- a sleeve which is permanently fixable to the cylinder in said working space, said slide face and said channel being located in said sleeve, said sleeve having an open cross-section which varies as a function of position of the piston rod, said open cross-section being formed by a pass-through channel facing said cylinder, and a plurality of bores extending axially along said sleeve and opening in said pass-through channel,
- a stop ring mountable to the piston rod in the working space so that tension damping can be changed in a stroke dependent manner, and
- a slotted, outwardly tensioned damping ring which cooperates with said stop ring, said damping ring being slideable against said slide face and seatable in said rest-position channel when said stop ring exceeds a predetermined position.
A vibration damper comprising
- a cylinder,
- a piston rod carrying a piston which is moveable axially in said cylinder,
- a piston rod guide fixed in said cylinder,
- a liquid-filled working space which is bounded axially by the piston rod guide and the piston, and radially by the cylinder and the piston rod,
- a sleeve which is permanently fixed to the cylinder in said working space, said sleeve comprising a slide face and a circumferential rest-position channel in said slide face, said channel having a conical surface,
- a stop ring mounted to the piston rod in the working space so that tension damping can be changed in a stroke dependent manner,
- a slotted, outwardly tensioning damping ring which cooperates with said stop ring, said damping ring being slideable against said slide face and seatable in said rest-position channel when said stop ring exceeds a predetermined axial position, and
- a stop sleeve which is attachable to the piston rod, said stop sleeve having at least one pass-through opening and a driver surface which bears against said damping ring to slide said damping ring against said slide face, and releases said damping ring when said damping ring seats in said rest-position channel.
A hydraulic tension stop for a vibration damper of the type comprising a cylinder, a piston rod carrying a piston, a piston rod guide, and a liquid-filled working space which is bounded axially by the piston rod guide and the piston, and radially by the cylinder and the piston rod, said tension stop comprising
- a slide face which is permanently fixable to the cylinder in said working space,
- a circumferential rest-position channel in said slide face, said channel having a conical surface,
- a stop ring mountable to the piston rod in the working space so that tension damping can be changed in a stroke dependent manner,
- a slotted, outwardly tensioned damping ring which cooperates with said stop ring, said damping ring being slideable against said slide face and seatable in said rest-position channel when said stop ring exceeds a predetermined position,
- a sealing disk located between the stop ring and the damping ring, and
- a stop sleeve which is attachable to the piston rod, said stop sleeve bearing against the sealing disk, said stop sleeve having at least one pass-through opening and a driver surface which bears against said damping ring to slide said damping ring against said slide surface, and releases said damping ring when said damping ring seats in said rest-position channel.
A hydraulic tension stop for a vibration damper of the type comprising a cylinder, a piston rod carrying a piston, a piston rod guide, and a liquid-filled working space which is bounded axially by the piston rod guide and the piston, and radially by the cylinder and the piston rod, said tension stop comprising
- a slide face which is permanently fixable to the cylinder in said working space,
- a circumferential rest-position channel in said slide face, said channel having a conical surface,
- a stop ring mountable to the piston rod in the working space so that tension damping can be changed in a stroke dependent manner,
- a slotted, outwardly tensioned damping ring which cooperates with said stop ring, said damping ring being slideable against said slide face and seatable in said rest-position channel when said stop ring exceeds a predetermined position,
- a sealing disk located between the stop ring and the damping ring, and
- a damping ring disk located between the stop ring and the sealing disk.
Dependencies are inferred from the claim text.