In some examples, an oscillatory pumping system comprises: one or more active piston, a fluid, and two motors. The one or more active piston is disposed in a channel fluidically coupling two fluid chambers. The passive piston has a frequency response operable to counteract a vibratory displacement. The fluid is disposed in the channel and the two fluid chambers. The two motors couple to the one or more active piston. The two motors are operable to selectively change the frequency response of the passive piston based on oscillating the one or more active piston.

In some examples, an oscillatory pumping system comprises: one or more active piston, a fluid, and two motors. The one or more active piston is disposed in a channel fluidically coupling two fluid chambers. The passive piston has a frequency response operable to counteract a vibratory displacement. The fluid is disposed in the channel and the two fluid chambers. The two motors couple to the one or more active piston. The two motors are operable to selectively change the frequency response of the passive piston based on oscillating the one or more active piston.

A vibration-damping device including: a first mounting member configured to be mounted to one of components of a vibration transmission system; a second mounting member configured to be mounted to an other of the components of the vibration transmission system; a main rubber elastic body connecting the first mounting member and the second mounting member elastically to each other; a bracket attached to the second mounting member, the bracket having a mounting part configured to be mounted to the other of the components of the vibration transmission system; a tubular outer member secured press-fit to the second mounting member; a mass member disposed within the tubular outer member; and a support rubber fixed at an outer peripheral part of the mass member, the support rubber elastically connecting the tubular outer member and the mass member to constitute a dynamic damper.

A hydraulic mount includes an inner tubular assembly, first and second elastomeric bodies and a fluid-track. The first and second elastomeric bodies are attached to the inner tubular assembly and cooperate to define a first fluid chamber. The second elastomeric body also defines a second fluid chamber that is in fluid communication with the first fluid chamber via the fluid-track. The fluid-track is attached to the inner tubular assembly partially disposed in the first fluid chamber. The fluid-track includes a central portion, a peripheral portion and a passage. The peripheral portion extends radially outwardly from a periphery of the central portion. The passage provides fluid communication between the first and second fluid chambers. Gaps are positioned between the peripheral portion and a wall of one of the first and second elastomeric bodies. The peripheral portion being configured to contact the wall during loading of the inner tubular assembly to restrict movement of the inner tubular assembly and the fluid-track.

A hydraulic mount includes an inner tubular assembly, first and second elastomeric bodies and a fluid-track. The first and second elastomeric bodies are attached to the inner tubular assembly and cooperate to define a first fluid chamber. The second elastomeric body also defines a second fluid chamber that is in fluid communication with the first fluid chamber via the fluid-track. The fluid-track is attached to the inner tubular assembly partially disposed in the first fluid chamber. The fluid-track includes a central portion, a peripheral portion and a passage. The peripheral portion extends radially outwardly from a periphery of the central portion. The passage provides fluid communication between the first and second fluid chambers. Gaps are positioned between the peripheral portion and a wall of one of the first and second elastomeric bodies. The peripheral portion being configured to contact the wall during loading of the inner tubular assembly to restrict movement of the inner tubular assembly and the fluid-track.

An engine mount which connects an engine to a vehicle body is provided. The engine mount includes a housing which defines a body of the engine mount and a main rubber body that is installed within the housing and defines a space portion that accommodates a fluid that flows through a nozzle plate. A core is inserted into and fixed to the main rubber body and an a fixing bolt is coupled to the core. A lower support bracket is coupled to the vehicle body and the fixing bolt is inserted therein. A damper that attenuates vibration is disposed at a lower side of the core or at first and second ends of the lower support bracket of the of the engine mount.

An engine mount which connects an engine to a vehicle body is provided. The engine mount includes a housing which defines a body of the engine mount and a main rubber body that is installed within the housing and defines a space portion that accommodates a fluid that flows through a nozzle plate. A core is inserted into and fixed to the main rubber body and an a fixing bolt is coupled to the core. A lower support bracket is coupled to the vehicle body and the fixing bolt is inserted therein. A damper that attenuates vibration is disposed at a lower side of the core or at first and second ends of the lower support bracket of the of the engine mount.

In some examples, an oscillatory pumping system comprises: one or more active piston, a fluid, and two motors. The one or more active piston is disposed in a channel fluidically coupling two fluid chambers. The passive piston has a frequency response operable to counteract a vibratory displacement. The fluid is disposed in the channel and the two fluid chambers. The two motors couple to the one or more active piston. The two motors are operable to selectively change the frequency response of the passive piston based on oscillating the one or more active piston.

In some examples, an oscillatory pumping system comprises: one or more active piston, a fluid, and two motors. The one or more active piston is disposed in a channel fluidically coupling two fluid chambers. The passive piston has a frequency response operable to counteract a vibratory displacement. The fluid is disposed in the channel and the two fluid chambers. The two motors couple to the one or more active piston. The two motors are operable to selectively change the frequency response of the passive piston based on oscillating the one or more active piston.

A hydraulic mount includes an inner tubular assembly, first and second elastomeric bodies and a fluid-track. The first and second elastomeric bodies are attached to the inner tubular assembly and cooperate to define a first fluid chamber. The second elastomeric body also defines a second fluid chamber that is in fluid communication with the first fluid chamber via the fluid-track. The fluid-track is attached to the inner tubular assembly partially disposed in the first fluid chamber. The fluid-track includes a central portion, a peripheral portion and a passage. The peripheral portion extends radially outwardly from a periphery of the central portion. The passage provides fluid communication between the first and second fluid chambers. Gaps are positioned between the peripheral portion and a wall of one of the first and second elastomeric bodies. The peripheral portion being configured to contact the wall during loading of the inner tubular assembly to restrict movement of the inner tubular assembly and the fluid-track.