Yamashita Rubber Kabushiki Kaisha

Yuji Mutoh

Kazutoshi Satori

Kouji Susa

An outer peripheral portion of an elastic member is formed integrally to a periphery of an inner cylinder that is unconnected and intimately contacted to an inside of the outer cylinder. A partition wall is formed between a main liquid chamber and an auxiliary liquid chamber which are communicated with an orifice passage, and end walls are formed at both ends in an axial direction, whereby they are respectively adjusted to resonate by membrane in medium to high frequency range. Cooperative resonance frequency of the partition wall with the end walls are set in the medium to high frequency range. In the main liquid chamber, a stopper is projected integrally from a main liquid chamber cover which is provided along an interior face of the outer cylinder and liquid column resonance is generated respectively between the partition wall and the end walls. An outer peripheral face of the inner cylinder is formed in a shape having a non-circular cross-section and a resin-made thick wall cover is integrated on a periphery thereof.

Liquid sealed type cylindrical anti-vibration apparatus

A long damping orifice 60 having a circular shape as viewed from above and a short linear idle orifice 61 are disposed and the orifices are connected by a common inlet 32, whereas an outlet side is formed separately into a first outlet 52 and a second outlet 53, which is opened and closed by a valve portion 21 which is in a unit with a diaphragm 7. Though the valve portion 21 is open by the negative suction-air pressure of an engine during idling, at this time, since the center of the second outlet 53 is shifted from the center of the valve body 21 toward a flowing direction of fluid flowing through the idle orifice 61, the valve portion 21 is open obliquely to prevent the turbulent flow of fluid in the vicinity of the second outlet 53, switching fluid-sealed mount characteristics rapidly.

Growing community of inventors

Saitama, Japan

Yuji Mutoh