Rubber spring，usually called pneumatic tyre, corrugated pneumatic tyre, gasbag, air blower, etc..

　　Rubber air spring has a convoluted construction. Usually, the number of convolutions is 1~3，whlie 4 or 5 convolutions can be developed at option. And in some circumstances, 2 springs can be used together.

　　The end closure construction of the present convoluted rubber air spring can be divided into 3 kinds according to connection difference: fixed bead ring connection, with the edge size of spring equal or larger than the max. diameter of the convolution, fastened connected with bead ring and end plate after drilling several holes；Another kind is ribbed neck aluminum bead ring, the edge size of the both size is much smaller than the max. diameter of the convolution, you may just fasten-connect it with bead ring and end plate without drilling; the last kind is self-sealing type, it could automatically sealed only after pumping pressed air and push down the end plate without bead ring connection.

　　Color plastic coated and metal bead ring or rubber multi ply spring steel bead ring is equipped for the convoluted rubber air spring with over 2 convolutions and fitted between the neighboring two convolutions