A hydraulic bearing for supporting an assembly of a motor vehicle includes a carrying bearing portion and a support portion. In embodiments, a working chamber that is fillable with hydraulic fluid is formed in the carrying bearing portion, and a compensating chamber that is fillable with hydraulic fluid is formed in the support portion. A nozzle disc, through which the flow can pass and which delimits the working chamber from the compensating chamber, may be arranged between the carrying bearing portion and the support portion, and a damping duct for the fluidic communication of the working chamber with the compensating chamber may be formed in the nozzle disc. In embodiments, the two chambers, the damping duct, and the hydraulic fluid may form a first damping system for damping vibrations of lower frequencies and a second damping system may be formed for damping vibrations of higher frequencies.

A hydraulic engine mount is provided in which related components out of two or more internal parts are coupled to reduce the number of components and to prevent oil leakage occurring due to coupling of the parts. The hydraulic engine mount includes a core that has a central bolt inserted into a central portion thereof, a rubber member formed on an outer circumferential surface of the core, upper and lower fluid chambers to seal a fluid therein. A diaphragm is disposed at a lower end of the lower fluid chamber and an orifice assembly divides the upper and lower fluid chambers from each other and has nozzle upper and lower plates. A nozzle upper plate-combined case that has a flow path is formed integrally with a lower part of the rubber member, and a lower part of the flow path is hermetically sealed by the nozzle lower plate.

A hydraulic mount for a vehicle includes: a core bush coupled to a bolt; a main rubber formed on an outer surface of the core bush; an orifice portion coupled to a lower portion of the main rubber so as to divide an upper fluid chamber and a lower fluid chamber, the orifice portion including a lower plate and an upper plate; and a membrane mounted between the lower plate and the upper plate. A fluid path is formed on an upper surface portion of the lower plate, a lower inlet and outlet port is formed on a predetermined position of the fluid path, an upper inlet and outlet port communicating with the fluid path is formed on the upper plate, a concave groove portion and a fixing end are repeatedly and uniformly formed along a circumference of the upper plate so as to cover the fluid path on the lower plate and be coupled thereto, and the membrane is exposed through the concave groove portion.

A limiting passage (24) includes: a first communication section (26) that opens to a first liquid chamber; a second communication section (27) that opens to a second liquid chamber; and a main body flow passage (25) that is configured to provide communication between the first and second communication sections. At least one of the first and second communication sections includes a plurality of fine holes (31). A vortex chamber (25b) is disposed at a portion of the main body flow passage, which is connected to at least one of the first and second communication sections, is configured to form a swirling flow of liquid according to a flow velocity of liquid flowing from the other of the first and second communication sections, and causes the liquid of the swirling flow to flow out through the plurality of fine holes. A barrier wall (36a) in which the plurality of fine holes are formed extends in a direction across a vortex axis along a central axis (O2) of the vortex chamber. Among the plurality of fine holes, fine holes located on an inner side in a swirl radial direction across the vortex axis in a top view of the barrier wall have a lower flow resistance than fine holes located on an outer side in the swirl radial direction.

A vertical decoupler assembly for a hydraulic mount including a first fluid chamber and a second fluid chamber includes a travel plate defining an interior space for receiving a removable vertical decoupler assembly. The vertical decoupler assembly includes an elastically deformable and tubular shaped diaphragm for dampening small vibrations across the mount. The vertical decoupler assembly may include an inner cage and an outer cage, each including a rigid, perforated, tubular wall disposed on either side of the diaphragm for limiting its radial deflection in each direction. The vertical decoupler assembly may include a rigid lower insert having an inverted cup shape with a second rim sealingly engaging the diaphragm and secured to the inner and outer cages. The decoupler diaphragm also includes a flange and a ring-shaped upper insert for nesting within and sealing against a throat at the upper end of the travel plate.

A vibration isolation device (10) of the present invention includes: a tubular first attachment member (11) coupled to one of a vibration generating part and a vibration receiving part, and a second attachment member (12) coupled to the other thereof; an elastic body (13) which couples both the attachment members together; and a partition member (16) which partitions a liquid chamber in the first attachment member (11) in which a liquid (L) enclosed into a first liquid chamber (14) and a second liquid chamber (15), in which at least one of the first liquid chamber (14) and the second liquid chamber (15) has the elastic body (13) as a portion of a wall surface thereof; and a communication passage (30) which communicates with the first liquid chamber (14) and the second liquid chamber (15), and a barrier rigid body (33) which is disposed in the communication passage (30) are provided in the partition member (16).

A vibration-damping device (1) of the present invention includes an outer cylinder (11), an inner member (12), an elastic body (13), a partition member (17), an intermediate cylinder (31), and a dividing member (32). The elastic body connects together the outer cylinder and the inner member. The partition member divides a liquid chamber (14) into the outer cylinder into a main liquid chamber (15) and an auxiliary liquid chamber (16). An orifice passage (21) is formed in the partition member. The intermediate cylinder (31) is disposed between the outer cylinder and the inner member and connected to the elastic body. The partition member is connected to the intermediate cylinder and divides the main liquid chamber into a first main liquid chamber (15a) and a second main liquid chamber (15b). An accommodation chamber (37), a first communication hole (37a), and a second communication hole (37b) are formed in the partition member. A movable member (36) which is displaced or deformed in accordance with a pressure difference between the first main liquid chamber and the second main liquid chamber is accommodated in the accommodation chamber.

In a vibration dampening device (10, 110) in an embodiment, a restriction passage (24) includes a first communication portion (26) that is open to a main liquid chamber (14), a second communication portion (27) that is open to an auxiliary liquid chamber (15), and a main body flow path (25) that causes the communication portions to communicate with each other, the first communication portion (26) includes a plurality of pores (31) penetrating a first barrier (28) having a surface (28a) facing the main liquid chamber (14), and a protrusion (40, 140) which protrudes toward the main liquid chamber (14) or the auxiliary liquid chamber (15) is formed over an entire circumference of an opening circumferential edge portion of the pore (31) in the surface (28a).

In the present invention, a restriction passage (24) includes a first communication portion (26) that is open to a first liquid chamber, a second communication portion (27) that is open to a second liquid chamber, and a main body flow path (25) that is configured to cause the first communication portion (26) and the second communication portion (27) to communicate with each other, and in a portion of the main body flow path (25) connected to at least one of the first communication portion (26) and the second communication portion (27), a guide portion (43) that is configured to guide a liquid from the other of the first communication portion (26) and the second communication portion (27) to an opposed surface (34a) that is opposed to one of the first communication portion (26) and the second communication portion (27) in an inner surface of the restriction passage (24) is disposed.

An engine mount includes a nozzle assembly for partitioning a fluid-filled space into an upper fluid chamber and a lower fluid chamber, wherein the nozzle assembly includes a first flow path to dampen vibrations with a first amplitude and a second flow path to dampen vibrations with a second amplitude greater than the first amplitude, so that the vibrations delivered from an engine can be efficiently reduced.