Rubber bushing of the technical conditions: 1.P direction stiffness 13000N/mm ~ 22000N/mm 2. Radial durability test: the radial bearing ± 44000N fatigue life under not less than 8 million 3. To reverse the durability test: In the Path 30000N to bear under the reverse ± 18 ° fatigue life of not less than 200 000 times