Hydraulic shock absorber

A hydraulic shock absorber, comprising:

• a housing and an absorber unit,
• wherein the absorber unit is movable relative to the housing in the axis direction of an absorber unit middle axis A-A and comprises a piston which is arranged on a piston rod and which subdivides the housing into a first and a second working space which is filled with damping fluid,
• wherein the piston has a piston unit which comprises a piston member, said piston member comprising a multitude of piston member flow channels which are suitable for the connection of the first and second working space and being stationary with respect to the piston rod, and a piston ring, said piston ring being coaxially arranged on the piston member in a displaceable manner in the axis direction of the absorber unit middle axis A-A and comprising a piston ring inner lateral surface,
• wherein a pressure plate which comprises pressure plate flow channels is arranged axially on both sides of the piston unit, said piston unit comprising the piston member which has a piston member outer lateral surface, and is resiliently biased against the piston unit by way of a spring force, so that the piston ring which comprises a piston ring outer lateral surface is arranged between the pressure plates,
• wherein the pressure plates are radially dimensioned such that a piston ring end-face which faces the pressure plates projects radially beyond the assigned pressure plate in a manner such that in the operating state the piston ring of the piston unit is displaceable by the damping fluid which presses upon the one piston ring end-face and the pressure plate on the other side is deflected against the spring force by way of the displacement of the piston ring, by which means a flow path through the piston member flow channels and the pressure plate flow channels of the pressure plate on the other side can be released for the throttled flow of the damping fluid between the two workings spaces, and
• wherein a piston member seal element for sealing between the piston member and the piston ring is arranged in a piston member groove which is formed in the piston member outer lateral surface or in the piston ring inner lateral surface.

A hydraulic shock absorber, comprising:

• a housing and an absorber unit,
• wherein the absorber unit is movable relative to the housing in the axis direction of an absorber unit middle axis A-A and comprises a piston which is arranged on a piston rod and which subdivides the housing into a first and a second working space which is filled with damping fluid,
• wherein the piston has a piston unit which comprises a piston member, said piston member comprising a multitude of piston member flow channels which are suitable for the connection of the first and second working space and being stationary with respect to the piston rod, and a piston ring, said piston ring being coaxially arranged on the piston member in a displaceable manner in the axis direction of the absorber unit middle axis A-A and comprising a piston ring inner lateral surface,
• wherein a pressure plate which comprises pressure plate flow channels is arranged axially on both sides of the piston unit, said piston unit comprising the piston member which has a piston member outer lateral surface, and is resiliently biased against the piston unit by way of a spring force, so that the piston ring which comprises a piston ring outer lateral surface is arranged between the pressure plates,
• wherein the pressure plates are radially dimensioned such that a piston ring end-face which faces the pressure plates projects radially beyond the assigned pressure plate in a manner such that in the operating state the piston ring of the piston unit is displaceable by the damping fluid which presses upon the one piston ring end-face and the pressure plate on the other side is deflected against the spring force by way of the displacement of the piston ring, by which means a flow path through the piston member flow channels and the pressure plate flow channels of the pressure plate on the other side can be released for the throttled flow of the damping fluid between the two workings spaces,
• wherein the piston ring comprises a piston support ring which has a piston support ring inner lateral surface and a piston support ring outer lateral surface, and a piston sealing ring which has a piston sealing ring inner lateral surface and a piston sealing ring outer lateral surface, and
• wherein a piston member seal element for sealing between the piston member and the piston support ring is arranged in a piston member groove which is formed in the piston member outer lateral surface or in the piston support ring inner lateral surface.

A hydraulic shock absorber, comprising:

• a housing and an absorber unit,
• wherein the absorber unit is movable relative to the housing in the axis direction of an absorber unit middle axis A-A and comprises a piston which is arranged on a piston rod and which subdivides the housing into a first and a second working space which is filled with damping fluid,
• wherein the piston has a piston unit which comprises a piston member, said piston member comprising a multitude of piston member flow channels which are suitable for the connection of the first and second working space and being stationary with respect to the piston rod, and a piston ring, said piston ring being coaxially arranged on the piston member in a displaceable manner in the axis direction of the absorber unit middle axis A-A and comprising a piston ring inner lateral surface,
• wherein a pressure plate which comprises pressure plate flow channels is arranged axially on both sides of the piston unit, said piston unit comprising the piston member which has a piston member outer lateral surface, and is resiliently biased against the piston unit by way of a spring force, so that the piston ring which comprises a piston ring outer lateral surface is arranged between the pressure plates,
• wherein the pressure plates are radially dimensioned such that a piston ring end-face which faces the pressure plates projects radially beyond the assigned pressure plate in a manner such that in the operating state the piston ring of the piston unit is displaceable by the damping fluid which presses upon the one piston ring end-face and the pressure plate on the other side is deflected against the spring force by way of the displacement of the piston ring, by which means a flow path through the piston member flow channels and the pressure plate flow channels of the pressure plate on the other side can be released for the throttled flow of the damping fluid between the two workings spaces,
• wherein the pressure plates are resiliently biased against the piston unit by way of one or more spring elements, and
• wherein the one or more spring elements are distanced to the piston member by way of a spacer sleeve, for limiting the biasing of the pressure plate.