Liquid composite spring and method for adjusting stiffness and damping property thereof

A method for adjusting stiffness and damping property of a liquid composite spring, comprising:

• preparing an outer sleeve and a plurality of core shafts of different models for the liquid composite spring, wherein said core shafts of different models have different damping flow channels;
• selecting, for corresponding stiffness and damping property, one core shaft from the different models of said core shafts according to requirements on actual frequency operation condition, placing said core shaft selected in the outer sleeve, and mounting a metal-rubber main spring in
• the outer sleeve so that an upper liquid chamber is formed above the metal-rubber main spring while a lower liquid chamber is formed below the metal-rubber main spring, the damping flow channel of the core shaft communicating the upper liquid chamber with the lower liquid chamber;
• and
• filling the upper liquid chamber and the lower liquid chamber with liquid, respectively, and sealing a lower end of the outer sleeve by a sealing member;
• wherein a core shaft is selected according to the requirements on the actual frequency operation condition,
• wherein under a low frequency operation condition a core shaft provided with a damping flow channel having a length-diameter ratio greater than 26 is selected, while under a high frequency operation condition a core shaft provided with a damping flow channel having a length-diameter ratio less than 26 is selected.