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US 2009/0260934 A1Published application
Shock absorber having resilient device in rebound chamber
AssigneeOhlins Racing AB
InventorsMagnus Danek, Henrik Schiolde
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AssigneeOhlins Racing AB
InventorsMagnus Danek, Henrik Schiolde
Estimating the term…
A shock absorber comprises a damping cylinder pressurized by a system pressure and divided by a piston into a compression chamber and a return chamber. A resilient device is disposed in the return chamber. The resilient device comprises a pressurizing member or pressurizing medium disposed in an inner volume that is delimited from the return chamber. The resilient device acts upon the damping medium volume in the return chamber such that the pressure initially during a compression stroke does not fall below a predetermined minimum pressure. As long as the pressure in the return chamber is less than the pressure created by the resilient device, the device is able to absorb energy. When the pressure in the return chamber is greater than the pressure created by the resilient device, the device becomes inflexible. The resilient device compensates for pressure reduction in the return chamber that occurs under rapid damping movements and that can cause cavitation during a compression stroke.
A method for controlling the pressure balance between two working chambers filled with damping medium and pressurized by a system pressure of a shock absorber, in which the shock absorber comprises a cylindrical body filled with a damping medium in the form of an oil and is divided by a main piston into a compression chamber and a return chamber in which a variable first damping medium pressure prevails in the compression chamber and a variable second damping medium pressure prevails in the return chamber, the second damping medium pressure in the return chamber being greater than a preselected minimum pressure by virtue of the fact that in or connected to the return chamber a resilient device in the form of an accumulator is provided, in which energy is stored through a build-up of pressure in a volume delimited against the return chamber in the resilient device and in which the stored energy is used to create a resilient function which gives rise to an increased pressure in the return chamber initially during the compression stroke.
A shock absorber intended for a vehicle, the shock absorber comprising a damping chamber adapted to be filled by a damping medium, the damping chamber adapted to be pressurized with a system pressure and the damping chamber being defined by a damping cylinder, the damping cylinder being divided by a main piston fastened to a piston rod, the main piston dividing the damping cylinder into a compression chamber and a rebound chamber, a variable first damping medium pressure adapted to act in the compression chamber, a variable second damping medium pressure adapted to act in the rebound chamber, a resilient device disposed directly adjacent to the return chamber, the resilient device comprising at least one of a pressurizing member and a pressurizing medium disposed in an inner volume enclosed from the return chamber and defined by the resilient device.
Dependencies are inferred from the claim text.