Shock absorber with dual piston

摘要

A shock absorber comprising a damping cylinder is divided into a first damping chamber and a second damping chamber by a main piston device. The main piston device comprises a first main piston and a second main piston. The main pistons comprise continuous ducts that are delimited in a direction of flow by first and second flow limiters. The main pistons are mounted on a piston rod. The piston rod has an axially extending and continuous cavity through which damping medium can flow between a pressurized chamber and a respective damping chamber. The damping medium flows via an interspace delimited by the first main piston and the second main piston out into the damping chambers via pressurization ducts delimited by the first flow limiters. The first flow limiters lift axially from the main piston with substantially maintained external form in the opening process so that a flow path is created both between the main piston and the whole or parts of the inner periphery of the first flow limiter as well as between the main piston and the outer periphery of the first flow limiter.

主权项

1. A shock absorber comprising:
a damping cylinder divided into a return damping chamber and a compression damping chamber by a main piston device; said main piston device comprising a first main piston and a second main piston, said first main piston comprising a first surface and a second surface, said second main piston comprising a first surface and a second surface, an interspace being defined between said second surface of said first main piston and said first surface of said second main piston of said main piston device; said first main piston and said second main piston being disposed on a fastening device, said fastening device secured to a piston rod, said piston rod comprising an axially extending and continuous cavity, said continuous cavity being configured to accommodate a damping medium flow between a pressurized chamber of a pressurization reservoir and at least one of said return damping chamber and said compression damping chamber; said first main piston comprising a first set of continuous pressurization ducts and said second piston comprising a second set of continuous pressurization ducts, a first main piston first flow limiter being positioned adjacent to said first surface of said first piston and a second main piston first flow limiter being positioned adjacent to said second surface of said second piston, said first main piston first flow limiter delimiting the first set of continuous pressurization ducts and said second main piston first flow limiter delimiting said second set of continuous pressurization ducts such that said interspace is fluidly connected to said compression damping chamber and said return damping chamber through said first main piston first flow limiter and said second main piston first flow limiter; said first main piston comprising a first set of main ducts and said second piston comprising a second set of main ducts, a first main piston second flow limiter being positioned adjacent to said second surface of said first main piston and a second main piston second flow limiter being positioned adjacent to said first surface of said second main piston; said first main piston first flow limiter and said second main piston first flow limiter allowing flow substantially without resistance through said first and second sets of continuous pressurization ducts such that the compression damping chamber and the return damping chamber are fluidly connected and said first main piston second flow limiter and said second main piston second flow limiter allowing flow into said interspace through said first and second sets of main ducts; and said first main piston first flow limiter and said second main piston first flow limiter are configured to lift axially away from said first main piston and said second main piston respectively with substantially maintained external form such that a first flow path is created both between said first main piston and at least at portion of an inner periphery of said first main piston first flow limiter and between said first main piston and at least a portion of an outer periphery of said first main piston first flow limiter, and such that a second flow path is created both between said second main piston and at least at portion of an inner periphery of said second main piston first flow limiter and between said second main piston and at least a portion of an outer periphery of said second main piston first flow limiter.