| 摘要 |
The invention concerns a vehicle wheel suspension (51) using a screw spring (52) and a flexible retaining and connecting armouring (53), which in working position, stresses a portion of the spring (52) by maintaining it compressed, for obtaining two different stiffness curves the reversal point of which is located in the vicinity of the working position; when there is compression, the screw spring assembly (52) is compressed whereas when there is strain relief, only the non stressed portion of said spring (52) is decompressed, the suspension being asymmetrical with strain relief stiffness which is greater than the compression stiffness. Each armouring (53) is made up of two fixing elements, one (54) co-operating with the whole or part of a spire of the screw spring (52), the other (56) co-operating either with the whole or part of another spire of said spring (52), or with the shock absorber body (59) and of a longitudinal element (55) capable of being deformed in compression but not so in strain relief, integral with the two fixing elements, the armouring (53) enclosing and stressing at least two spires of the screw spring (52).
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