Abstract: An elastic partition member located in the partition member is integrally provided with a relief valve that opens and closes a leak passage to suppress the generation of the cavitation phenomenon. A pair of relief valves is formed in a crescent shape on the outer circumferential side of the movable diaphragm section in opposed relation. The crescent shape of the relief valve is formed by an inner circumferential side of elliptical arc shape and an outer circumferential side of circular arc shape. A valve length of the relief valve varies in the longitudinal direction such that a middle portion in the longitudinal direction is largest. is easily deformed when the extraordinary vibration is inputted. Each end portion in the longitudinal direction of the relief valve is short in valve length and high in rigidity whereby to prevent the leak when the normal vibration is inputted.

Abstract: In the inverted type liquid sealed engine mount in which a secondary liquid chamber is located above, an insulator protrudes in a mountain shape into a primary liquid chamber, and a resistor is provided within an annular recess section formed around the protruding portion. The resistor is mounted by insertion into an engaging recess of a lining layer and elastically supported by ribs so as to be movable in the annular recess section due to liquid flowing in the circumferential direction. A regulation gap is provided between the resistor and the insulator. Although a peculiar resonance occurs when the liquid passes through the regulation gap, the peak of the anti-resonance is decreased and the frequency is moved, since the resistor is movable.

Abstract: A partition member for partitioning a primary liquid chamber and a secondary liquid chamber is provided with a damping orifice passage and an elastic partition member. A stopper leg portion is integrally formed with and projects from a lower wall of an elastic diaphragm portion provided in a central region of the elastic partition member 30 so as to be pressed on a pressed surface of a support wall of a frame member. A third liquid chamber is defined by the support wall, the elastic partition member and the stopper leg portion and is opened in the vicinity of a primary liquid chamber side opening of the damping orifice passage through a relief passage. The pressed surface is increased in diameter as it goes upward.

Abstract: An elastic partition member located in the partition member is integrally provided with a relief valve that opens and closes a leak passage to suppress the generation of the cavitation phenomenon. A pair of relief valves is formed in a crescent shape on the outer circumferential side of the movable diaphragm section in opposed relation. The crescent shape of the relief valve is formed by an inner circumferential side of elliptical arc shape and an outer circumferential side of circular arc shape. A valve length of the relief valve varies in the longitudinal direction such that a middle portion in the longitudinal direction is largest. is easily deformed when the extraordinary vibration is inputted. Each end portion in the longitudinal direction of the relief valve is short in valve length and high in rigidity whereby to prevent the leak when the normal vibration is inputted.

Abstract: A partition member for partitioning a primary liquid chamber and a secondary liquid chamber is provided with a damping orifice and an elastic partition member. A leg portion integrally projects from a lower surface of the movable diaphragm so as to be pressed vertically against a stopper surface formed on an upper surface of the bottom portion of a frame member. A third liquid chamber is defined between an outer circumferential portion of the leg portion and the support wall. When a bottom surface of the leg portion is pressed against the stopper surface, the third liquid chamber is sealed to confine a hydraulic fluid thereby increasing the internal pressure. When the leg portion is brought out of contact with the stopper surface, the third liquid chamber is opened to the secondary liquid chamber, thereby allowing the hydraulic fluid to flow out of the third liquid chamber.

Abstract: In the inverted type liquid sealed engine mount in which a secondary liquid chamber is located above, an insulator protrudes in a mountain shape into a primary liquid chamber, and a resistor is provided within an annular recess section formed around the protruding portion. The resistor is mounted by insertion into an engaging recess of a lining layer and elastically supported by ribs so as to be movable in the annular recess section due to liquid flowing in the circumferential direction. A regulation gap is provided between the resistor and the insulator. Although a peculiar resonance occurs when the liquid passes through the regulation gap, the peak of the anti-resonance is decreased and the frequency is moved, since the resistor is movable.

Abstract: A liquid sealed vibration isolating device has first and second mounting members and an insulator placed between the mounting members. A partition member partitions a liquid chamber into primary and secondary liquid chambers. A valve portion provided on a diaphragm enclosing the secondary liquid chamber opens and closes a port of a passage between the liquid chambers. The valve portion has an annular thick wall portion which contacts a valve seat portion provided around the port and a movable elastic diaphragm portion provided on an inside of the wall portion and is thinner than the wall portion so as to be elastically deformable by a pressure of the hydraulic liquid. The hydraulic liquid passing through the passage causes orifice resonance when the passage is opened by the valve portion. The diaphragm, including the valve portion, membrane-resonates at a frequency in the vicinity of a resonance frequency of the orifice resonance.

Abstract: A partition member for partitioning a primary liquid chamber and a secondary liquid chamber is provided with a damping orifice and an elastic partition member. A leg portion integrally projects from a lower surface of the movable diaphragm so as to be pressed vertically against a stopper surface formed on an upper surface of the bottom portion of a frame member. A third liquid chamber is defined between an outer circumferential portion of the leg portion and the support wall. When a bottom surface of the leg portion is pressed against the stopper surface, the third liquid chamber is sealed to confine a hydraulic fluid thereby increasing the internal pressure. When the leg portion is brought out of contact with the stopper surface, the third liquid chamber is opened to the secondary liquid chamber, thereby allowing the hydraulic fluid to flow out of the third liquid chamber.

Abstract: A partition member for partitioning a primary liquid chamber and a secondary liquid chamber is provided with a damping orifice passage and an elastic partition member. A stopper leg portion is integrally formed with and projects from a lower wall of an elastic diaphragm portion provided in a central region of the elastic partition member 30 so as to be pressed on a pressed surface of a support wall of a frame member. A third liquid chamber is defined by the support wall, the elastic partition member and the stopper leg portion and is opened in the vicinity of a primary liquid chamber side opening of the damping orifice passage through a relief passage. The pressed surface is increased in diameter as it goes upward.

Abstract: A liquid sealed vibration isolating device having a first mounting member to be mounted on the side of a vibration source, a second mounting member to be mounted on the side to be vibrated, and an insulator being placed between said first and second mounting members so as to absorb vibration. A liquid chamber uses the insulator as a part of a wall thereof and is filled with a hydraulic liquid. A partition member partitions the liquid chamber into a primary liquid chamber and a secondary liquid chamber. A passage is provided between the primary and secondary liquid chambers. A valve portion is provided on a diaphragm enclosing the secondary liquid chamber to open and close a port of the passage.

Abstract: A partition member for dividing a fluid chamber into a main fluid chamber and a sub-fluid chamber is provided with an idle orifice passage of which the opening is opened and closed by a seating section provided on part of a diaphragm. A pushing member is provided to control the opening and closing operation. The seating member is formed thick of which the upper and lower surfaces are provided with depressions respectively. The seating member is also provided with a thin section of which the periphery is provided with a hemispheric protrusion and a seal of a substantially right triangle cross section. An elastic body section is also provided at the side surface with a lateral membrane section.

Abstract: 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. When the fluid is filled and sealed in the cone-shaped mounting section and the cylindrical bushing section, the characteristics where a fluid is sealed in only the cone-shaped mounting section and the characteristics where the fluid is sealed in only the cylindrical busing section are coupled. Furthermore, the dynamic spring peaks and the dynamic spring bottoms, which are generated one by one in both sections, 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.

Abstract: A partition member for dividing a fluid chamber into a main fluid chamber and a sub-fluid chamber is provided with an idle orifice passage of which the opening is opened and closed by a seating section 20 provided on part of a diaphragm 15. A pushing member is provided to control the opening and closing operation. The seating member 20 is formed thick of which the upper and lower surfaces are provided with depressions 51, 52 respectively. The seating member 20 is also provided with a thin section 53 of which the periphery is provided with a hemispheric protrusion 54 and a seal 55 of a substantially right triangle cross section. An elastic body section 3 is also provided at the side surface with a lateral membrane section.

Abstract: 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. When the fluid is filled and sealed in the cone-shaped mounting section and the cylindrical bushing section, the characteristics where a fluid is sealed in only the cone-shaped mounting section and the characteristics where the fluid is sealed in only the cylindrical busing section are coupled. Furthermore, the dynamic spring peaks and the dynamic spring bottoms, which are generated one by one in both sections, 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.

Abstract: 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.

Abstract: A cone-shaped mounting (1) is provided in which a main fluid chamber (10) is formed by a first connecting member (3) a second connecting member (5), an elastic body member (7), a partition member (8) and a first orifice passage (15). A part of an elastic wall of the main fluid chamber (10) is an inner wall of the elastic body member (7). The first orifice (15) communicates with a sub-fluid chamber (11). An input direction of a main vibration is arranged to be the Z-axis direction (the vertical direction of a car body). Side fluid chambers (20) and recessed chambers (25) are alternately provided at intervals of 90° in the circumferential direction on the outer circumference of the elastic body member (7). An outer wall of the elastic body member (7) forms a part of an elastic wall of the side fluid chambers (20). A pair of side fluid chambers (20) is disposed in the longitudinal direction of the car body.

Abstract: In a manufacturing of an anti-vibration device comprising, an elastic member 3 of a generally truncated cone shape when viewed from a side, a first mounting member 1 is connected to an upper portion thereof, a second mounting member 2 is connected to a lower portion thereof, a stopper projection 12 projects from the first mounting member 1 to a side portion to be capable to abut a half round side portion of the elastic member 3, and a stopper metal member 35 extends from the second mounting member 2 through an outside of the stopper projection 12 to cover the about half round side portion of the elastic member 3 to the first mounting member 1 side with a stopper receiving portion 36 by bending an apex portion thereof to superpose on the stopper projection 12 with a specified gap. The stopper receiving portion 36 can be formed by caulking or the like after the molding the elastic member 3.

Abstract: A cone-shaped mounting 1 is provided in which a main fluid chamber 10 is formed by a first connecting member 3, a second connecting member 5, an elastic body member 7, a partition member 8 and a first orifice passage 15. A part of an elastic wall of the main fluid chamber 10 is an inner wall of the elastic body member 7. The first orifice 15 communicates with a sub-fluid chamber 11. An input direction of a main vibration is arranged to be the Z-axis direction (the vertical direction of a car body). Side fluid chambers 20 and recessed chambers 25 are alternately provided at intervals of 90° in the circumferential direction on the outer circumference of the elastic body member 7. An outer wall of the elastic body member 7 forms a part of an elastic wall of the side fluid chambers 20. A pair of side fluid chambers 20 is disposed in the longitudinal direction of the car body. A second orifice 24 is arranged to communicate with the paired side fluid chambers to provide a cylindrical bushing section 2.

Abstract: A liquid chamber is arranged with a first support member 1, a second support member 2 and an elastic member 3, an inside of the liquid chamber is divided to a main liquid chamber 11 and an auxiliary liquid chamber 12 by a partition member 10 and both chambers are communicated with a damping orifice passage 14 and an idle orifice passage 15. On an inner face of a conical portion 4 of the elastic member 3, thin wall portions 7 are provided by forming recess 6 at axially symmetrical position so as to yield a minimum value for a dynamic spring characteristic against a vibration input in a designated medium frequency by a membrane resonance. A non-circular medium to high frequency device 20 projecting into the main liquid chamber 11 is provided to the first support member 1 so as to resonate by liquid column against a vibration input in a designated high frequency.

Abstract: A liquid sealed type bushing including an outer cylinder, an inner cylinder and an elastic member. Recesses are formed on a middle portion of the elastic member. The elastic member between the recesses is adapted to be a partition member and a thin wall portion is formed by providing a through hole in the partition member, and an outer peripheral portion of the partition member is made to contact but not combine with an inner face of the outer cylinder. Within the recess, a medium to high frequency device is supported by the inner cylinder. By overlapping a peak caused by a membrane resonance owing to the thin wall portion of the partition member, and a minimum value caused by a liquid column resonance of the medium to high frequency device, a low dynamic spring constant is attained in a medium to high frequency region.