The axlebox suspension spring made from steel-rubber multi layer structure is adopted for lightening and low maintenance of the bolsterless bogie designed about 20 years ago. However the deterioration of rubber by long use, especially creep phenomenon causes decrease in spring height that makes necessary adjustment of the axlebox height. Therefore we optimized mix proportion of rubber compound element such as a carbon black, a stabilizer for anti-oxidising, so that we can keep stability of the axlebox height. By the optimized mix proportion of rubber compound we could decrease creep phenomenon by 40%. We have also confirmed that the developed rubberspring could ensure the same vehicles' dynamic properties as the conventional one.

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