Fluid-sealed anti-vibration device

• Main Authors: SAKAMOTO, TORU, SATORI, KAZUTOSHI
• Format: Patent
• Language: English; French; German
• Published: 13.02.2008
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MEANS FOR DAMPING VIBRATION; MECHANICAL ENGINEERING; SHOCK-ABSORBERS; SPRINGS; THERMAL INSULATION IN GENERAL; WEAPONS

A fluid-sealed anti-vibration device is provided, in which a cone-shaped mounting section provided with an elastic body section which generates membrane resonance, and a cylindrical bushing section provided with an end wall and an elastic partition wall which also generate membrane resonance are integrally provided. As shown in a characteristic curve ‘¢ in the case where a fluid is filled and sealed in only the cone-shaped mounting section, the dynamic spring bottom B1 is generated by the membrane resonance of the elastic body section in the frequency a and the dynamic spring peak P2 is generated on the higher frequency side d. On the other hand, as shown in the characteristic curve ‘¡ in the case where the fluid is filled and sealed in only the cylindrical bushing section, the dynamic spring peak P1 is generated by the membrane resonance of the end wall in the frequency b, and the dynamic spring bottom B2 is generated on the higher frequency side c, where the relationship of the frequency is a < b < c < d. When the fluid is filled and sealed in the cone-shaped mounting section and the cylindrical bushing section, these characteristic curves ‘¡ and ‘¢ are coupled, and the dynamic spring peak P 1 and the dynamic spring bottom B1, and the dynamic spring peak P2 and the dynamic spring bottom B2 cancel each other. As a result, it is possible to realize the low dynamic spring effect in a wider frequency range by lowering the dynamic spring peak. Side fluid chambers of a cylindrical bushing portion are provided at the center, left and right sides in the front and rear of which each is provided with three chambers and three pairs of the front and rear fluid chambers are communicated with three kind of the orifice passages and the different liquid column resonance frequency of each orifice passage are coupled, thereby it is realized to attain low dynamic spring constant at optional frequency. A cone-shaped mounting section is provided with the elastic partition walls extending radially in the front and rear direction and in the lateral direction and the elastic portion walls are compressed while assembling, thereby the spring ratio in the front and rear direction is controlled.