A wheel assembly bushing for in-wheel electric motors where the bushing includes a hydraulic chamber positioned within a resilient sleeve of the bushing and a helical fluid channel that extends helically about an inner bushing member between first and second fluid channel ends, which are arranged in fluid communication with the hydraulic chamber. An outer body extends annularly about the resilient sleeve, which permits relative movement between the inner bushing member and the outer body. The fluid channel is configured to produce inertance. This inertance, when combined with other damping and stiffness effects of the wheel assembly bushing, provides phase and magnitude shifts between force and velocity, which ultimately reduce magnetic gap deformation in the in-wheel electric motor.

In the present invention, any two of a second liquid chamber (27), a third liquid chamber (28), and a fourth liquid chamber (29) communicate with each other through a first restricted passage (31) formed in an outer attachment member (11), an inner attachment member (12) or a partition member (15), and the remaining one liquid chamber communicates with a fifth liquid chamber (32) formed in the outer attachment member (11), the inner attachment member (12) or the partition member (15), the remaining one liquid chamber is divided in a circumferential direction, and each of the liquid chambers divided in the circumferential direction and the fifth liquid chamber (32) separately communicate with each other through a second restricted passage (33) formed in the outer attachment member (11), the inner attachment member (12) or the partition member (15).

A hydraulic mount includes: an outer pipe having a diaphragm defined thereon by vulcanization; a main rubber member disposed in the outer pipe by press-fitting; a core disposed inside the main rubber member; a ring stopper interposed between the diaphragm and the main rubber member; a first fluid chamber and a second fluid chamber configured by depressing both sides of an outer circumference of the main rubber member towards the core, each of the first and second fluid chambers configured to accommodate a fluid; a third fluid chamber configured to communicate with the first fluid chamber and the second fluid chamber, disposed in a part of the main rubber member under the core, and accommodating the fluid; and a fourth fluid chamber configured to communicate with the third fluid chamber and disposed between the ring stopper and the outer pipe to accommodate the fluid.

A variable stiffness bushing assembly includes an inner tubular member, an outer tubular member coaxially surrounding the inner tubular member, and an elastic member connecting the inner and outer tubular members. The elastic member defines a pair of first liquid chambers that are on opposite sides of an axial line of the inner tubular member and communicate with each other via a first circumferentially extending communication passage defined between one of the outer yokes and the annular large diameter portion, and a pair of second liquid chambers that are on opposite sides of the axial line and communicate with each other via a second circumferentially extending communication passage defined between another one of the outer yokes and the annular large diameter portion. The magnetic fields generated by the two coils are selectively applied to a magnetic fluid flowing through the first communication passage and the second communication passage.

A bush-type hydraulic mount used for mounting a motor module in an electric vehicle is provided. The bush-type hydraulic mount includes an inner pipe, a middle pipe disposed coaxially with the inner pipe, and a main rubber that is vulcanized between the inner pipe and the middle pipe. An outer pipe surrounds the middle pipe. The main rubber includes a front fluid chamber that is recessed from a surface of the main rubber, a rear fluid chamber adjacent to the front fluid chamber and recessed from the surface of the main rubber, and a bridge that separates the front fluid chamber and the rear fluid chamber to allow fluid to flow between the front fluid chamber and the rear fluid chamber and being deformable by external force.

A hydro bushing includes an outer pipe, an inner pipe disposed within the outer pipe and spaced apart from the outer pipe, an elastic body disposed between the outer pipe and the inner pipe and provided with a liquid chamber portion accommodating liquid therein, and a nozzle disposed between the outer pipe and the elastic body and including a stopper extending toward the liquid chamber portion such that a portion of an internal surface of the nozzle protrudes to be in contact with the liquid chamber portion. A contact end of the stopper is formed to have a surface corresponding to deformation of the elastic body caused by conical movement.

A hydraulic mount is provided and includes: an inner core, a cage that surrounds the inner core, an elastomer body that extends between the inner core and the cage and elastically connects them to each other, and an outer sleeve that encloses the cage. The elastomer body has a first circumferential fluid chamber recess and a second circumferential fluid chamber recess. The first fluid chamber recess and the second fluid chamber recess are each limited in a radially outwards direction by the outer sleeve to form a first fluid chamber and a second fluid chamber. The elastomer body is configured to be substantially undercut-free in an axial direction on its axial end faces. The elastomer body and the cage are configured to be substantially undercut-free in the region of the first fluid chamber recess and the second fluid chamber recess, at least in two predetermined, mutually opposite radial directions.

A powertrain component mount includes a housing, a main rubber element, a hydraulic body, a membrane and a valve. The main rubber element has an outer armature, an inner armature and an isolating element coupled to the armatures, the isolating element being formed of a material that is more flexible than the outer armature and the inner armature, wherein the main rubber element defines at least part of a fluid flow path. The hydraulic body supports the outer armature of the main rubber element, defines part of the fluid flow path, a fluid chamber, and part of a control chamber communicated with the fluid flow path. The hydraulic body has a port open to the control chamber. The membrane defines part of the control chamber and the valve has a valve head movable between a first position closing the port and a second position spaced from the port.

This vibration-damping device is configured such that an outer mounting member (11), an inner mounting member (12), or a partition member (16) has formed therein: a first restriction passage (23) for providing communication between a fourth liquid chamber (21) and a second liquid chamber (15) or a third liquid chamber (20); and a second restriction passage (24) for providing communication between the second liquid chamber (15) and the third liquid chamber (20). The flow resistance of the first restriction passage (23) and that of the second restriction passage (24) are different.

A liquid filled bushing assembly includes an inner tubular member (11), an outer tubular member (12) disposed in a coaxial relation to the inner tubular member, and an elastic member (13) interposed between the inner tubular member and the outer tubular member, wherein not only the stiffness of the liquid filled bushing assembly in the lateral directions can be freely selected but also the stiffness of the liquid filled bushing assembly in the rotational direction and/or the axial direction can be freely selected.