Shock absorber

The shock absorber as claimed in any one of the preceding patent claims, wherein the first space (14) is designed with a thickened wall in the portion concerned of the cylinder wall.

The shock absorber as claimed in any one of the preceding patent claims, wherein both a member (30) performing the bleed function and a member performing the non-return valve function are arranged in the second space.

The shock absorber as claimed in any one of the preceding patent claims, wherein the member (30) performing the bleed function can be controlled in order to obtain a bleed function which can be regulated by controls.

The shock absorber as claimed in any one of the preceding patent claims, wherein the second space (15) or recess is connected, via one or more first passages or side holes (32) in the piston rod wall, to the space (18) outside the outer wall of the piston rod between the first and second pistons (5, 6).

The shock absorber as claimed in any one of the preceding patent claims, wherein the second space or recess is connected, via one or more second passages or side holes (31) in the piston rod wall, to the space (23) outside the piston rod behind the second (6) and, respectively, in front of the third piston.

The shock absorber as claimed in any one of the preceding patent claims, wherein the first or front piston (5), that is to say the piston closest to the free end of the piston rod, has a diameter which corresponds to the diameter of the first space and is smaller than the diameter of the rest of the cylinder part, and in that the first piston (5) is designed with first working medium passages which can be activated essentially in the position of the first piston in the first space and via which first working medium passages the working medium then flows.

The shock absorber as claimed in any one of the preceding patent claims, wherein the second piston has on the one hand a diameter corresponding to the full-size diameter of the cylinder, and on the other hand second working medium passages, at which shims or shim packs (11, 12) are arranged on or at the lower and upper sides of the second piston (6).

The shock absorber as claimed in any one of the preceding patent claims, wherein a continuous damping-force regulation function is afforded by means of the shims or shim packs (11, 12) of the second piston, and increased end position damping is effected by means of the position of the first piston (5) in or at the first space (14).

The shock absorber as claimed in any one of the preceding patent claims, wherein said shock absorber is intended to form part of a motorcycle or a two-wheeled or three-wheeled vehicle.

The shock absorber as claimed in any one of the preceding patent claims, wherein said shock absorber is intended to form part of a car or a four-wheeled vehicle.

The shock absorber as claimed in any one of the preceding patent claims, wherein the piston rod consists of a first piston rod part (4a) which, at the front, is made with a part (4a′) of reduced diameter, on which the second piston (6) is mounted, and in that the piston rod also comprises a second piston rod part (4b) of bushing-like design, in which the part of reduced diameter extends.

The shock absorber as claimed in any one of the preceding patent claims, wherein the non-return valve function interacting with the bleed function comprises a non-return valve which can be acted on when an expansion movement of the shock absorber takes place and, in the acted-on position, opens a passage for the bleed flow.

The shock absorber as claimed in any one of the preceding patent claims, wherein the non-return valve performing the non-return valve function closes a passage for the bleed flow when a compression movement of the shock absorber takes place.

The shock absorber as claimed in any one of the preceding patent claims, wherein the non-return valve performing the non-return valve function is provided with a cup-shaped part or a cover part which has no bleed hole or is provided with one or more bleed hole(s), the bleed flow being prevented from passing through or being capable of passing through in a modified quantity for the purpose of preventing or, respectively, modifying the bleed function when compression takes place relative to when expansion takes place.

The shock absorber as claimed in any one of the preceding patent claims, wherein the members performing the bleed and the non-return valve functions are positioned at each end of the second part space (15b′).

The shock absorber as claimed in any one of the preceding patent claims, wherein the member performing the bleed and the non-return valve function consists of a spring-loaded member, for example a ball, arranged in the piston working outside the first space, and, by means of a spring and medium pressure exerted, seals against a seat when compression movement takes place, and is lifted from the seat against the action of the spring by means of medium pressure exerted when an expansion movement takes place, the bleed flow being prevented or acted when compression takes place and flowing when expansion takes place.