Patent ID: 6082718
Filing Date: 2000-07-04
Classification: F16F

Abstract:
A liquid-sealing type vibration isolating apparatus comprising:a first coupling member attachable to a vibrator;a second coupling member attachable to a member on a vehicle body;an insulator interposed between the first coupling member and the second coupling member for absorbing and isolating vibration from the vibrator;a vibration isolating mechanism including:a main chamber having a chamber wall formed by one portion of the insulator and charged therein with liquid;an auxiliary chamber and a partition panel partitioned from the main chamber across a partition wall and communicating with the main chamber through an orifice; anda chamber wall portion formed by a first diaphragm, an air chamber partitioned from the auxiliary chamber across the diaphragm, and an equilibrium chamber partitioned from the main chamber across a second diaphragm;selector means for carrying out change-over operation so as to introduce negative pressure or the atmospheric pressure into the equilibrium chamber in the vibration isolating mechanism;control means for controlling the change-over operation of the selector means;a negative pressure tank having a predetermined volume arranged between a negative pressure source using intake negative pressure of an engine and the selector means;a check-valve provided between the negative pressure source and the negative pressure tank for introducing only negative pressure into the negative pressure tank; anddrive means for operating a selector valve in the selector means, the drive means including a solenoid mechanism;wherein the partition wall is composed of a body portion having an outer peripheral portion formed therein with the orifice, the second diaphragm provided on the main chamber side of the body portion and defining the equilibrium chamber between itself and the body portion, and the partition panel arranged between the second diaphragm and the main chamber, defining a third liquid chamber between itself and the second diaphragm, and formed therein with a second orifice; andthe partition panel partitioning between the main chamber and the equilibrium chamber is formed of two panels which are joined to each other, and the second orifice is formed in the two panels so as to be circumferentially extended, the second orifice communicates at one end with the main chamber and the other end with the equilibrium chamber, one of the two panels is formed in its outer peripheral portion with an arcuate groove so as to define a space serving as the second orifice between itself and the other one of the partition panels, a communication hole communicates with the main chamber or the auxiliary chamber is formed in a wall surface at one end side of the groove, the other side end portion thereof is bent toward the center of the panel, and a through-hole serving as a communication hole communicated with the main chamber or the auxiliary chamber is formed in the center portion of the other one of the panels so that the through-hole is overlapped with the other side end portion of the groove.