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A damper, especially for a suspension of a vehicle. The damper provides a reactive inertia force in response to movement of a shaft. In some embodiments, there is also a piston providing viscous damping. In some embodiments, the shaft of the damper telescopes with an internal shaft. The internal sha

A damper, especially for a suspension of a vehicle. The damper provides a reactive inertia force in response to movement of a shaft. In some embodiments, there is also a piston providing viscous damping. In some embodiments, the shaft of the damper telescopes with an internal shaft. The internal shaft and a coupling member coact to convert linear motion of the external shaft to an internal rotary motion.

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1. A hydraulic damper, comprising: a housing defining a cavity for hydraulic fluid;a piston slidable within the cavity and including a peripheral seal dividing the cavity into a first volume and a second volume;a first rod linearly slidable relative to said cavity and having an end extending outside

1. A hydraulic damper, comprising: a housing defining a cavity for hydraulic fluid;a piston slidable within the cavity and including a peripheral seal dividing the cavity into a first volume and a second volume;a first rod linearly slidable relative to said cavity and having an end extending outside of the cavity, said piston being attached to said first rod, said first rod having an internal channel;a second rod located at a position within said housing and adapted and configured to be received within the internal channel; and;a coupling member in contact with said first rod and said second rod;wherein linear motion of said first rod is converted to rotary motion of one of said second rod or said coupling member. 2. The damper of claim 1 wherein said converting means is a ballscrew mechanism, wherein said coupling member is a ballscrew nut and said second rod is a ballscrew rod. 3. The damper of claim 2 wherein said ballscrew rod is fixedly attached to said housing. 4. The damper of claim 2 wherein said ballscrew rod is rotatably coupled to said housing by a bearing. 5. The damper of claim 2 wherein said ballscrew nut is rotatably coupled to said piston or to said shaft by a bearing. 6. The damper of claim 1 wherein one of said first rod or said second rod is telescopically received within the other. 7. The damper of claim 1 which further comprises a weight coupled to the one of said second rod or said coupling member, said weight being repeatedly couplable and decouplable to the one of said second rod or said coupling member. 8. The damper of claim 1 which further comprises a plurality of substantially identical weights coupled to the one of said second rod or said coupling member, said weight being repeatedly couplable and decouplable to the one of said second rod or said coupling member. 9. The damper of claim 1 wherein said housing includes a removable end cap and a rotatable weight attached to the one of said second rod or said coupling member, and said weight is accessible within said damper after said end cap is removed, said rotatable weight being adapted and configured with inertial characteristics such that rotation of said weight provides a reactive inertial force in response to movement of said first rod relative to said cavity. 10. The damper of claim 1 which further comprises means for permitting restricted flow between the first volume and the second volume that includes at least one valve for permitting flow with a predetermined flow characteristic. 11. The damper of claim 1 which further comprises at least one, one-way valve permitting restricted flow between the first volume and the second volume. 12. The damper of claim 1 which further comprises an orifice permitting flow between the first volume and the second volume. 13. The damper of claim 1 wherein said damper is coupled to the suspension of a vehicle, and one end of said external rod is coupled to a portion of the vehicle suspension, and said cylinder is coupled to a portion of the vehicle. 14. The damper of claim 1 which further comprises a bearing for rotatably supporting the one of said second rod or said coupling member. 15. The damper of claim 1 wherein said housing has a longitudinal axis, and said rod and said second rod are concentric about the axis. 16. A hydraulic damper, comprising: a cylindrical housing defining a cavity for hydraulic fluid;a piston slidable within the cavity and dividing the cavity into a first volume and a second volume;a first rod linearly slidable relative to said cavity and having an end extending outside of the cavity, said first rod having an internal channel;a second rod fixedly attached within said housing and adapted and configured to be received within the internal channel during linear movement of said first rod;a coupling member rotatably attached to said first rod and in contact with said second rodwherein said coupling member rotates in response to movement of said first rod relative to said housing. 17. The damper of claim 16 wherein said second rod includes an external spiral groove. 18. The damper of claim 17 wherein the rotation of said coupling member is guided by the groove. 19. The damper of claim 16 wherein said coupling member is wetted with hydraulic fluid. 20. The damper of claim 16 wherein said housing has a longitudinal axis, and said first rod and said second rod are concentric about the axis. 21. The damper of claim 16 wherein said piston is fixedly attached to said first rod. 22. The damper of claim 16 which further comprises a bearing for rotatably supporting said coupling member on said first rod. 23. The damper of claim 16 which further comprises a pair of thrust bearings for rotatably supporting said coupling member. 24. The damper of claim 16 wherein said piston is attached to said first rod, and said coupling member is adapted and configured to have inertial characteristics such that said damper provides primarily a reactive inertial force in response to movement of said first rod relative to said cavity. 25. A hydraulic damper, comprising: a cylindrical housing containing hydraulic fluid;a piston having two sides and being slidable within said housing;a first rod linearly slidable relative to said cavity and having an end extending outside of the cavity;a second rod rotatable within said housing and adapted and configured to be telescopically coupled to said first rod;a coupling member linearly moveable in fixed relationship with said first rod and in contact with said second rodwherein said second rod rotates in response to movement of said first rod relative to said housing. 26. The damper of claim 25 wherein said second rod is supported within said housing by a bearing. 27. The damper of claim 26 wherein a pair of ball bearings support said second rod. 28. The damper of claim 25 wherein said second rod is wetted with hydraulic fluid. 29. The damper of claim 25 wherein said coupling member is attached to said first rod. 30. The damper of claim 25 wherein said coupling member is a ballscrew nut and said second rod is a ballscrew rod. 31. The damper of claim 25 wherein said damper is coupled to the suspension of a vehicle, and the external end of said first rod is coupled to a portion of the vehicle suspension, and said cylinder is coupled to a portion of the vehicle. 32. The damper of claim 25 wherein said housing includes a removable end cap and a removable inertia weight rotatable by said second rod, wherein removing said end cap provides access to remove said weight. 33. The damper of claim 25 wherein said second rod is received within a passage of said first rod. 34. The damper of claim 25 wherein said coupling member includes an outer member and a plurality of recirculating balls, said balls being in contact with said second rod.