Abstract:
A hydraulic mount assembly includes a pair of mounting members connected to each other through a hollow elastomeric body of natural or synthetic rubber. The body is closed by a resilient diaphragm so as to form a cavity for damping liquid. A partition or plate is provided to divide the fluid filled cavity into two distinct chambers. A primary chamber is formed between the partition and the interior wall of the hollow body. A secondary chamber is formed between the partition and the interior wall of the diaphragm. The partition includes at least two passages connecting the two chambers. A sliding gate extends across the entry to the passages. This gate is displaceable to direct the flow of fluid between the primary and secondary chambers through a selected passage or passages in the partition. A solenoid actuator mounted on the partition includes multiple electric coils that allow the positive positioning of the gate. A control circuit with onboard transducers is provided to monitor vehicle operating and road conditions. A microprocessor acts in response to the sensed conditions causing the necessary sequential energization of the series of coils.
Abstract:
The invention provides a hydraulic antivibratory support interposed between a vehicle chassis and engine, including a work chamber (A) and a compensation chamber (B) filled with liquid and joined together through a nozzle (19) whose section, which determines the frequency of the best damped oscillations, can be modified even during operation of the support. This nozzle is defined at least partially by a deformable wall (20) and modifications of the section of the nozzle are obtained by deforming the wall.
Abstract:
A casing accommodating a liquid is divided by a partitioning member into two sections. The partitioning member is secured to either an engine or vehicle body,and the walls of the two sections facing the partitioning member are secured to the enging or vehicle body, to which the partitioning member is not secured. The partitioning member is provided with an orifice mechanism which can vary the state of communication between the two sections. When the engine is going to roll, the orifice mechanism is controlled to restrict the communication between the two sections to increase the damping force, whereby the rolling of the engine is prevented.
Abstract:
A compound engine mount has a first and a second fluid chamber defined thereinside and communicated to each other by a first orifice which is controllable in length and a second orifice which is controllable in effective path area. In an engine idling range, the two fluid chambers are intercommunicated by the first orifice only. The length of the first orifice is controlled to change the mass of a fluid inside of the orifice in response to a length of the orifice, whereby the dynamic spring constant of the engine mount is controlled. In a high engine speed range, the fluid chambers are intercommunicated by the second orifice resulting in a decrease in the dynamic spring constant of the engine mount. The effective area of the second orifice is controllable to control the dynamic spring constant.
Abstract:
The attenuator has a chamber filled with hydraulic fluid and bordered by a diaphragm effective to impart oscillatory movement to a slug of such fluid. During high frequency excitation the inertial forces of the oscillating fluid slug minimize the dynamic stiffness of the attenuating device. The particular excitation frequency at which the foregoing occurs is controlled by an annular tuning plate or assembly disposed in non-engaging relationship to the diaphragm and having an opening which may be adjustable in size either automatically or manually.
Abstract:
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.
Abstract:
Methods and systems are provided for a dual state hydromount in order to passively introduce air underneath a decoupler such that the stiffness of the air pocket adds to the stiffness of the decoupler, thereby increasing a level of damping available in a vehicle ride mode, the ride mode defined by vehicle speeds greater than a threshold speed. In one example, a dual state hydromount is described wherein a partitioning structure may be alternately coupled to either vacuum or atmosphere, and when coupled to atmosphere an air spring is created under the decoupler via the passive directing of air to the decoupler via a one way check valve. In this way, introduction of an air spring is achieved without additional active control.
Abstract:
A tunable vibration isolator having a housing, fluid chamber, and at least one tuning passage. A piston assembly is resiliently disposed within the housing. A vibration isolation fluid is allowed to flow from the fluid chambers through the tuning passage. A metering valve is actuated up and down in order to change the effective diameter of the tuning passage, resulting in a change to the isolation frequency.
Abstract:
A vibration-damping device includes: an elastic body connecting a tubular first mounting member and a second mounting member; and a partition member partitioning a fluid chamber within the first mounting member, the fluid chamber being filled with fluid, into a primary fluid chamber on one side and an auxiliary fluid chamber on another side. The partitioning member includes: the limiting passages communicating between the primary and the auxiliary chambers, and generating fluid column resonance with respect to input vibration, thereby damping and reducing the vibration; switching device switching between the resonance frequencies of the limiting passages; a connection passage connecting the primary and the auxiliary chambers; a fluid pressure introducing passage into the switching device to operate the switching device; and a thin film body provided within the connection passage, and blocking the communication between the primary and the auxiliary fluid chambers via the connection passage.
Abstract:
A fluid-filled type vibration damping device having a first and a second fluid chamber respectively filled with non-compressible fluid and which experience relative pressure fluctuations during vibration input, and provided with an orifice passage through which the first fluid chamber and the second fluid chamber communicate with one another, while being capable of exhibiting better dependability and durability in terms of effective vibration damping action of several types of vibration with different frequencies. In the device, tuning frequency of the orifice passage is varied by varying a passage length of the orifice passage 68 through adjustment of an insertion distance of an inside orifice member into an outside orifice member.