Intermediate supporting cushion rubber of transmission shaft

The invention relates to an intermediate supporting cushion rubber of a transmission shaft, belonging to rubber materials. The intermediate supporting cushion rubber is prepared by the following materials according to part by weight: 76 to 84 portions of natural rubber NR, 19 to 21 portions of butadiene rubber BR, 1.4 to 1.6 portions of stearic acid, 4.8 to 5.2 portions of zinc oxide, 1.4 to 1.6 portions of anti-aging agent, 1.4 to 1.6 portions of secondary anti-aging agent, 1.1 to 1.3 portions of dispersing agent, 2.8 to 3.2 portions of paraffin, 38 to 42 portions of carbon black Carbot N774, 9.5 to 10.5 portions of carbon black Carbot N550, 1.1 to 1.3 portions of vulcanizing agent, 1.1 to 1.3 portions of accelerator CA, and 0.19 to 0.21 portion of accelerator TT. The intermediate supporting cushion rubber has the following advantages: ozone resistance and other anti-aging properties are good, no crazing phenomenon exists in ozone resistance test with 50pphm/72h; no damage exists in one million times of dynamic fatigue tests; compression set is less than 15 percent; and the intermediate supporting cushion rubber has good state when being mounted on a car and used for 80 thousand kilometers, thus solving the phenomenon of early-stage damage of the intermediate supporting cushion of the transmission shaft in use, and improving the reliability of the transmission shaft.