In a hydraulic cylinder piston unit comprising a cylinder with an interior space delimited by opposite end walls in which a piston and a compensation seal element are movably arranged supported by a piston rod and engaged by a compensation spring disposed between the compensation seal element and an adjacent cylinder end wall, the compensation seal element has two spaced seal rings via which it is guided along the inner cylinder wall and the compensation spring is supported directly on the compensation seal element for an improved sealing effect of the compensation seal element in the extended state of the hydraulic cylinder piston unit and a simplified design.

In a hydraulic cylinder piston unit comprising a cylinder with an interior space delimited by opposite end walls in which a piston and a compensation seal element are movably arranged supported by a piston rod and engaged by a compensation spring disposed between the compensation seal element and an adjacent cylinder end wall, the compensation seal element has two spaced seal rings via which it is guided along the inner cylinder wall and the compensation spring is supported directly on the compensation seal element for an improved sealing effect of the compensation seal element in the extended state of the hydraulic cylinder piston unit and a simplified design.

The present exemplary embodiments relate to a variable damping force shock absorber in which variable valves each capable of varying a damping force during compression and rebound strokes are installed inside a cylinder, and thus, a volume of an apparatus is reduced to easily secure an installation space and prevent interference with peripheral components.

The present exemplary embodiments relate to a variable damping force shock absorber in which variable valves each capable of varying a damping force during compression and rebound strokes are installed inside a cylinder, and thus, a volume of an apparatus is reduced to easily secure an installation space and prevent interference with peripheral components.

Disclosed herein are active hydraulic cylinders for use in active vehicle suspension systems, and methods for assembling active hydraulic cylinders for use in an active vehicle suspension system. In particular, in certain embodiments a manifold may encircle a portion of an outer tube of a twin tube assembly. The manifold may mechanically and fluidly couple a pump assembly to the twin tube assembly. In certain embodiments, the manifold may be welded onto the outer tube.

Disclosed herein are active hydraulic cylinders for use in active vehicle suspension systems, and methods for assembling active hydraulic cylinders for use in an active vehicle suspension system. In particular, in certain embodiments a manifold may encircle a portion of an outer tube of a twin tube assembly. The manifold may mechanically and fluidly couple a pump assembly to the twin tube assembly. In certain embodiments, the manifold may be welded onto the outer tube.

Provided is a shock absorber capable of suppressing a great change in a damping force even upon a stroke change. The shock absorber with a pilot chamber includes: a housing that constitutes the pilot chamber and includes a pilot hole and an inflow passage; a disk valve body that allows a fluid inside the pilot chamber to be discharged outside via the pilot hole; and a check valve body that allows the fluid to flow into the pilot chamber through the inflow passage.

Provided is a shock absorber capable of suppressing a great change in a damping force even upon a stroke change. The shock absorber with a pilot chamber includes: a housing that constitutes the pilot chamber and includes a pilot hole and an inflow passage; a disk valve body that allows a fluid inside the pilot chamber to be discharged outside via the pilot hole; and a check valve body that allows the fluid to flow into the pilot chamber through the inflow passage.

A damping force adjustment mechanism includes a casing that accommodates a working fluid, a seal member that divides an interior of the casing into a first fluid chamber and a second fluid chamber, a housing that holds the seal member and is accommodated in the casing, and adjusting a damping force of the working fluid in the housing, a damping valve accommodated in the housing, a first pilot chamber and a second pilot chamber formed in the housing, a control chamber formed in the housing, a control valve dividing an interior of the control chamber into first and second control chambers, an actuator configured to electrically drive and control the control valve, first and second communication passages, first and second stationary orifices respectively provided in the first and second communication passage, and a third stationary orifice provided in a third communication passage provided in the control valve.

A damping force adjustment mechanism includes a casing that accommodates a working fluid, a seal member that divides an interior of the casing into a first fluid chamber and a second fluid chamber, a housing that holds the seal member and is accommodated in the casing, and adjusting a damping force of the working fluid in the housing, a damping valve accommodated in the housing, a first pilot chamber and a second pilot chamber formed in the housing, a control chamber formed in the housing, a control valve dividing an interior of the control chamber into first and second control chambers, an actuator configured to electrically drive and control the control valve, first and second communication passages, first and second stationary orifices respectively provided in the first and second communication passage, and a third stationary orifice provided in a third communication passage provided in the control valve.