Vibration-absorbing mounting device with hydraulic damping, especially for engines

Claim 1

A vibration-absorbing engine mounting device with hydraulic damping, comprising: an upper mounting means; a lower mounting means; a resilient wall means interposed between said upper and lower mounting means, said wall means having an upper portion and a lower portion firmly and air-tightly bonded to said upper mounting means and said lower mounting means, respectively; a ring-shaped mass damper transversely and air-tightly provided in said resilient wall means at an intermediate portion thereof; means defining a closed chamber enclosed by said mounting means, and resilient wall means and said mass damper; capsule means including a sealed exterior rigid case oriented wholly inside said closed chamber means; an inflatable and deflatable sealed bag capable of changing its volume by expansion or contraction, said bag being wholly encased in said sealed rigid case; a volume of gas sealed between said sealed bag and said rigid case; an orifice member in said sealed bag and extending through said sealed rigid case to said closed chamber means, the interior of said sealed bag communicating with said closed chamber by way of said orifice member, said sealed bag and said closed chamber being filled with a damping fluid, the rate of fluid exchange between the interior of said sealed bag and said closed chamber being controlled by a throttle effect of said orifice member, whereby the combination of said resiliency of said resilient wall and said throttle effect of said orifice member provide the vibration-absorbing characteristic of said engine mounting means; and wherein said rigid case is oriented in said closed chamber so as to be wholly surrounded by said damping fluid.