| 摘要 |
PURPOSE:To enable to deform the rubber bellows naturally with an enlarged stroke and reduced stress by a method wherein a piston and a cylinder, which are provided with special configurations and constituted so that the inner peripheral length of the cylinder becomes same as the outer peripheral length of the piston, are utilized. CONSTITUTION:The inner periphery of the cylinder 1 is made so as to have a rectangular form with rounded corners while the outer periphery of the piston 2 is formed so as to be rectangle provided with wavy figures. According to this method, the inner peripheral length of the cylinder 1 becomes same as the outer peripheral length of the piston 2. Accordingly, the rubber bellows 3 can be extended and contracted without receiving any unreasonable stress and the bellows can be ved to the cylinder 1 side and the piston 2 side alternately with a bending effect only. A tension is applied only in the axial direction of the cylindrical bellows 3, therefore, cords buried in the rubber as core members can stand against the tension. No stress is applied to the circumferential direction of the bellows, therefore, no reinforcing member is needed and the bellows may be deformed without receiving any unreasonable stress. |
